RealPOV is not the only one, but it is one of only a few. Kplug also has POV functionality.
Sounds like an incompatibility with the Experience Logic mod. The only way to fix it is to alter its code or the gameplay tweaks mod code to be compatible in that case. That would mean getting the modder to fix it. The other thing that can be done is uninstall the Experience Logic mod, which should be in BepInEx/Plugins as a single DLL file.
About the same as the requirements for the game, I would say. I'll put it this way, mine runs it fine, but mine has an i7 6700HQ 2.6 to 3.5 GHz processor, that's 3.5 at max turbo frequency and 2.6 normally, 24GB DDR4 RAM, and a GTX 1060 6GB card. The RAM is the big factor with Illusion games and yours might just be enough.