I think the Chaotic Potential AA just doesn't work at all. But, since the client can buy it, it thinks that it is working and calculates the HPs as if it did work. But, if you do a #showstats, it will show you the actual HPs, which from what I have seen proves that it isn't working.
Also, food doesn't seem to add any stats, even though the client calculates it as if it was adding HPs etc.
I have heard that KMRA and maybe a couple of other servers have fixed some of the issues with the level 71+ stats, but I haven't seen anywhere that they are sharing the code. And, I don't have the time to level past 70 there to test it.
The stats not showing up properly, because of skills rolling over is one of the main issues I have on my server for characters who are over level 70. The only other issue I am aware of is that everytime someone with level 71 or higher spells zones, all of their 71+ spells get removed from their spellbook. I had to add the #scribespells command so everyone can access it as a temporary work around for this. Though, I would love a better solution for these 2 issues
