The script prc_pwondeath didn't compile until I added a void main to it. Thought you might want to know. BTW, should I remove all of the PRC XP switches when using this system?
Yes, you'll need to disable them. The level adjustment for powerful races is already taken into account by the system. If you don't want to use the level adjustment rule, then the original pwfxp on the vault would be fine.
If you were using the racial hit dice switch, leave that on, as it has no effect on XP, just on leveling up.