To check the memory consumption run the game in windowed mode and just see how much it uses in the task manager.
Reshade of course adds some additional memory usage though I would be surprised to hear it is that significant (also I have more than 2000 rims in SlrrExhaustive with it so it should not directly be reshade or did you exceed this?)
The class thing is just that if you have classes with the same name it can naturally cause conflicts in the game these errors are just like you described random and have strange effects
