I did as you said, but I must add a recent development about the issue:
I lowered my overclock's core and cache ratios (core 4,5-cache 4,0) and lowered the core voltage (which had 0,025 adaptive). This fixed the problem and I no longer crash in the said instances.
However, I was abled to play around 80 hours stable with the OC values I just posted and never experienced a crash. It only started to cause this problem after the latest hotfix. Did the latest hotfix increase CPU usage or AVX usage? Only thing that comes to mind to break stability on my stable OC is increased usage of AVX usage tbh.