I think it's fine where it is, but increasing the max bet will make investors more money in the long run
Please don't do this. Variance will burn us investors big time. The edge is already very low. The more small bets there are, the closer it gets to the ideal of 'you give us your money, we give you 99% back, you give it to us again we give 99% of THAT back, and every 72 turns we have half your money'.
Larger bets means someone can make a score at our expense with a few large bets and some discipline.
Players will play however they want, not as you want. Of course it's better for the house if variance is low.
I wish we had more high rollers, as they lose more money in average, even if variance is high. If you don't and are and investor, you should at least partially divest.