DFS Optimizer Top 10 Mistakes (Fantasy Football)
Optimizers are an excellent tool for efficiently entering multiple lineups into more tournaments to diversify your DFS game. They can also be one of the easiest to misuse. A few small mistakes can lead to frustrating errors, wreck entire builds, and make the process the opposite of what we want: fun.
- It is not a magic wand.
- It will not magically spit out winning lineups.
- It is a data tool and is only as good as the levers you pull/adjust on it.
Your job is to use the populated Baller projections, included Ownership %, and other presets to help you pull the right levers to find some winning lineups. All of our tools and picks are found exclusively in the DFS Pass.
This guide breaks down the Top 10 mistakes we’ve seen/heard from the Footclan.
We also have an #optimizer channel in the Footballers Discord. Go under Footclan DFS/Betting and you will see it. Don’t hesitate to reach out to us there or DM me for help. I want to see YOU take down a DFS tournament this year.
Make sure to watch the original optimizer tutorial here.
1. Not Adjusting at least One Exposure
The Optimizer won’t run until you tweak the player table. It’s an easy fix, but the first error you’ll encounter if you push the big Build button without making changes.
Why: Due to community guidelines, you must modify at least one setting before building.
Fix: Drop one player’s Max Exposure from 100% to 99% to unlock your first build/run.
2. Not Refreshing the Page
Users research by opening new tabs (or looking at their phone), leave the optimizer open, then return and attempt to build.
Why: Sessions go stale if the page sits idle for too long.
Fix: Refresh before you start building to avoid errors or lineups that sit there churning with no output.
3. Setting Min Exp Over 100%
On the Players page, users set the Min Exp of too many players that add up to more than 100%.
Why: The optimizer can’t satisfy rules that require more lineups than exist.
Fix: Keep total player Exp Min under 100%.
4. Setting Max Exp Under 100%
On the Players page, users set the Max Exp of too many players taking the total below 100%.
Why: This prevents the optimizer from building and forces unnecessary limits across the pool.
Fix: Keep total player Exp Max over 100%
5. Over-Extending the Build Settings Page
Changing too many presets at once can overload the optimizer and cause errors.
Why: The Build Settings page is powerful, but small missteps create impossible rules the optimizer can’t satisfy.
Fix:
- Bracketed Ownership: Use the drop-down menu (Large Field, Single Entry, Cash). After clicking “Use Presets,” refrain from making changes unless you know precisely why you’re making them. To avoid errors, leave ranges expanded instead of locked. For example, you could take 25% to 4 – 9 instead of 6 – 9.
- Lineup Ranges:
- Salary: Keep between $49,500–$50,000 for GPPs. Going lower leaves fewer optimal combinations (historical data proves this). Avoid errors by not locking one price unless playing in a small field with limited rules.
- Total Ownership: The starting preset is suitable, but the best results typically fall between 90% and 140%. Avoid errors by maintaining a 50% range.
- Min Unique Players: Good for diversity, but avoid errors by never going above five. Recommend: two or fewer.
- Over Max Exposure Security: Toggle this only when you want hard caps.
- Flex Parameters – Flex percentages must total 200+. In large GPPs takedowns, WR dominates, RB appears sometimes, and TE rarely. Adjust accordingly.
- Randomness – Use the levers to introduce variance in Ballers’ projections and DFSForecast/FTN ownership.
6. Setting Exposure Min/Max BEFORE Building
A common mistake is capping exposures or removing players before you’ve even seen a single lineup. Build lineups first THEN adjust.
Why: We know we’re cutting players, but by limiting them too early, you risk losing strong lineup combinations the optimizer may find and invite more errors.
Fix:
1. On the Players page, click Build to generate your first lineups.
2. Go to the Build Summary to review exposures.
3. Start adjusting Min/Max one player at a time until you’re happy with the results. Adjusting will take multiple runs, and adjusting slowly helps you track which setting might cause errors.
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Step 1: Review the Overweight/Underweight chart to see where you’re heavy or light compared to projections.
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Step 2: Check the Player Breakdown to confirm actual exposure vs projected ownership.
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Step 3: Use the search bar on the Players page to manually adjust min/max exposure for specific players. For example, if you’re 36% overweight on Bijan Robinson, lower his Max Exposure until the pool is balanced or you get the leverage % you want player(s) by player(s).
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Simulation Results Explanation
These sims estimate how your lineups would perform over thousands of slates. Each column shows where your pool stands compared to the field.
- My Pct. – The percentage of your lineups that hit each metric
- Top 5 Finish – How many lineups finished in the top 5
- Top 50 Finish – How many lineups finished in the top 50
- Cashed – How many lineups finished above the cash line
- Lost – How many lineups lost
In this example, the build cashed 540,601 times, compared to 1,818,126 losses. 65.33% of lineups had at least one player under 2.5% ownership, 56% with at least two under 5%, and 100% with at least three under 10%. You can go column by column to see what parameters did well in the simulation.
Why it matters: These metrics show if your build has enough ceiling (top finishes) and uniqueness (ownership thresholds) to succeed in the contest simulated against similar lineups with the same player pool.
7. No Slate Plan
One of the biggest mistakes is jumping straight into the optimizer without a plan for the slate you’re playing. Contest type and context completely change how you should build lineups. Your exposure, stacking rules, and ownership fades should all be shaped by entry size, field size, slate size, and stake level. Without defining those variables first, you end up with lineups that don’t match the contest you’re entering. Always pause before you build and answer: What type of contest am I playing, how many people are in it, how many games are on the slate, and how much money is on the line? The easiest way to remember what matters is the acronym FESS:
- Field size – 500 entries vs 200,000 entries requires different approaches.
- Entry size – Single-entry, 3-max, 20-max, or 150-max each all need different parameters.
- Slate size – An 8-game NFL slate has a tighter player pool than a 12-gamer.
- Stake size – A $1 contest and a $250 contest will have different user skill sets, and you need to account for that when building/creating a narrative for lineups.
Why: Without defining FESS, your lineups don’t align with the contest structure and lose edge.
Fix: Always check your FESS before you press build so your optimizer settings match the contest you’re playing.
8. Over-Managing Your Player Pool
One of the fastest ways to kill your upside is being dogmatic with exposures. DFS is a game of probabilities, not certainties. When you over-manage lineups, you essentially tell the optimizer, “I know exactly how this slate will play out.” That’s never true. Any week, a player like Tre Tucker can go for 8/143/3, and no analyst or fantasy player can predict it with certainty. If your rules are too rigid, you’ll never have a path to those ceiling outcomes.
Player takes are fine. If your favorite play is 15% owned, increasing it to 30% provides leverage. However, taking it to 80% means that the player MUST HIT CEILING. Injuries and variance can erode your bankroll over time with this mindset. If those players don’t reach their ceiling, those lineups are essentially drawing dead in terms of ROI.
Why: Locking your pool too tightly assumes perfect foresight and eliminates the random variance that wins tournaments.
Fix: Let the optimizer breathe first, then refine. Protect flexibility so unexpected breakouts can still reach your builds.
9. Skipping Correlation Rules
Users assume the optimizer will naturally build stacks, but it only sees individual projections, not how players interact with each other. Without correlation rules, you’ll get lineups with naked QBs, no bring-backs, and no game environment leverage.
Why: DFS is correlation-driven. Passing QB points come from skill players, RBs may correlate negatively with their QB (but not always), and shootouts raise the ceiling for both sides of a game. Ignoring correlation wastes upside.
Fix: Use the Team Stacks menu to set rules that reflect how games actually play out.
- Team Stack % – Ensures QBs pair with at least one pass catcher.
- Game Stack % – Forces bring-backs from the other side in shootout games.
- Secondary Game Stack % – Adds mini-stacks like RB + opposing WR.
- Stacked Players/Positions – Control how many WR/TEs attach to your QB.
Example: Instead of letting the optimizer run 20% naked QBs, set 95% Team Stack, 50% Game Stack, 35% Secondary Stack. This way, your builds reflect game flow and increase ceiling outcomes.
If you’re confused about what each column is for or does, move your cursor over the top of the menu, and a black box will explain it.
10. Treating Showdown Like a Main Slate
Most users hit “build” and end up with basic 3-3 constructions (three players from each team) because DK’s pricing usually aligns with these builds and it matches median projections.
Why: The optimizer defaults to balanced builds, which look fine but rarely separate you in large Showdown fields. When lines get duped hundreds of times, even a “winning” lineup can lose money.
Fix:
- Use game theory. Create leverage with 4-2 or even 5-1 builds by going to Team Stacks and selecting which side gets 4 (or 5) players. This forces lineups to fall into actual game scripts (e.g., one team controlling the game or blowing out the other).
- If you do go 3/3, consider picking lower-owned lineups.
- Leave salary on the table. For GPP, you’ll often see salaries of $47,500, $49,100, and other lineups under $49,500 at the top of the leaderboard. Don’t be afraid to be weird to stand out.
- Defenses/Kickers win Showdowns less than 5% of the time when they are in the CPT spot. We recommend setting the CPT Max Exp to zero on these positions.
- In the Player Groups Page, make sure a QB is in the FLEX when a WR is in the CPT spot. Small Field lineups with a WR at CPT rarely win tournaments without the QB in the FLEX. In Large Field you may not need this rule in order to get unique. There are more options/tweaks available as you improve (such as limiting the RBs when the QB is in the CPT spot).
We now have an #optimizer channel in Footballers Discord. Go under Footclan DFS/Betting and you will see it. Don’t hesitate to reach out to us there or DM me for help. I want to see YOU take down a DFS tournament this year. I also have made this video for reference.