So asking Skull about this resulted in the cap idea sort of being out of the window as it would mean he needs access to the plugin which although he is now involved in some development for panda jailbreak it's not to that level.
The next best thing is the ratio convar
sm_tf2jail_balance_ratio - 0.5 - Ratio for autobalance: (Example: 0.5 = 2:4)
Default is 1:2 (2:4 - 0.5) which might be what panda is set to, but I've had different answers regarding to what the ratio is actually set to.
Would like a confirmation of what the ratio is even set at
Banana's screenshot 9:22 makes it 0.4091 which may confirm it's set to 0.5 (1:2) since it's greater than 0.4
So 1:3 is 0.333
1:4 is 0.25
As
@Racer911-1 pointed out in a particular discord we could try different ratios, perhaps something in-between 1:2 - 1:3 ? 0.4 is between them 2 : 5
If anybody would like to understand how this works, here is a link to help with converting ratio's to decimals and visa versa
https://www.inchcalculator.com/ratio-to-decimal-calculator/
For now I believe we are just taking in feedback and waiting for a possible conversation between banana and semicolon backslash, but I have a feeling that is going to have the same result.
Would probably be better this suggestion is scrapped and made new with a ratio suggestion once it's confirmed capping is not feasible.