[HybridChiller]

don't use XMP, but set the ram as specs manual.
also put the specs of timing manual in bios and voltage to 1.66v.

Then maybe only need to adjust the QPI/VTT voltage for stability as how hard you're uncore goes.

Normally QPI volt is somewhere between 1.3 to 1.4 , maybe 1.45v max if you don't OC to much

[MaadDaawg]

what happens when you increase the ram or CPU speed? Any difference if you only use one stick of RAM at a time? Try one stick in each DIMM slot to rule out mobo issues. Could be an IMC issue too, do you have another chip you could swap in?