In terms of experience, you should be ready for $50. I worry that your high-variance game might appreciate more of a cushion before you move up. Also, how come you're playing so much but not making more money? Are you cashing out? Or are you only a marginal winner? If it's the latter I think you need to make every effort to deal with your leaks - there's really no excuse to be making less than say 4BB/100 at $25.