We really do love numbers going up (or down in this case). I'm a little concerned about scaling like that, because of the effect it would have on those that struggle and get to the higher levels of stats, if they pull off two parries for instance, even at the lower exponential level, it would have a HUGE impact when their base stats are that high already. It's an amazing idea, I'll definitely explore how the balance of such a mechanic would work, thanks for you feedback!
(I've added a bunch of statistics at the end anyway)