1: Has anyone modded the coreunitstats xml?

I have and i cannot confirm that the AI is using it correctly. Specifically, I increased level up stats 2-3x, among other things, and the AI sovereigns still look like that have stock stats at level 3. Anyone else have this problem?

2: I thought I read somewhere that spell casting costs were hard coded at 2.0, and that Wisdom does not change that.

So what does Wisdom do? Furthermore, if casting costs aren't hard coded has anyone found them? They aren't in the corespells_something xml.