If your main interest is PSI, you might need to find another pack to learn it, as the recipe for thebase machines were tweaked... i didn't realise by just how much though. The Pack devs clearly want to push PSI late game, even though i don't think it offers much when pushed past the ender dragon that other mods can't handle by that point. (my most used PSI spell atm is a simple blink spell, which is arguably inferior to a staff of traveling from ender io.)