I believe a nice Ascension Perk would be "Every 1 Million Overflow XP = 1 RP". This would make Fast Learner another strategic decision for accumulating more RP and not feeling as if all that left over XP is a waste.
I like the Crit Power %...easy to understand. I would prefer Crit Percentage vs. Crit Rating though. Much easier to understand. Thanks for making this awesome game, great job!