What would be a really cool solution, is that that you dynamically adjusted the limits based on the persons bet multiple. However, I can't really see how to do that cleanly in bustabit without removing the manual-cashout, which would totally suck.
I think you shouldn't pay attention to this. 0-EBG point moves from 2xKelly very slow and only in extreme cases.
max profit = 1xKelly or 2xKelly minus HE looks good solution for me.