After about a week of testing, it looks like the problem is almost solved as there's only one game where my PC would crash. I'm not sure if I should make a new thread as I'm not sure if this is a different problem.
There has been a total of 6 crashes, 5 managed to give BSODs, but only 4 produced dump file:
1st crash: didn't manage to dump, screen frozen
2nd crash: didn't manage to dump as it was stuck at 0% during dumping, was caused by nvlddmkm.sys with bug check string "SYSTEM_THREAD_EXCEPTION_NOT_HANDLED".
3rd crash: BSOD dump gives different culprit when showing the BSOD screen (luafv.sys, "SYSTEM_SERVICE_EXCEPTION") than the one stated by BlueScreenView (FLTMGR.SYS, "SYSTEM_THREAD_EXCEPTION_NOT_HANDLED").
4th to 6th crash: BSODs as normal
Thank you in advance.