I figured out how to win consistently.
As early on as possible, aim to be a financial powerhouse. Whenever you play a really good hand, hopefully a 21 sum, striptease in groups and raise in increments of 100. If there's someone you want to single out, constantly fondle them. You do not want to have a high IQ because it'll make your fondle game rough, so spamming striptease to drop from 150 to 100 is a valid plan. Whenever you can overpower anyone with just fondling, whittle down their IQ over long periods of times by extending the round via raises. if they fold, you get all their IQ and money, reducing the pool as a whole, and making yourself even harder to topple.
The best way to prevent this somewhat clear exploit from existing would be to prevent any person from being allowed to raise twice in a row if someone else didn't between raises.