GPU Tweak III OC Mode is always causing games to crash (especially graphically demanding AAA games). I didn't change any settings of the app. Only using it to turn on OC Mode right before run the game and revert it back to default mode at the end of ...

I'm disabling in-game lighting effects but it turning itself on when i restart my computer. Is that a problem? If yes, how can i solve this issue?

I can't decide which option will be the best choice for gaming. HDR-10 or DCI-P3 (99%)? (My priority is visual fidelity btw)