How's prime running? Would be surprised if you are getting a few errors in LinX but can pass Prime without any. I only test with full memory with LinX, no point testing it with less as it's too weak and not diagnostic.
Why is your uncore so low? You can gain plenty of performance getting that up to where it should be
Lastly, when you quote voltages, what are your real load voltages as per CPU-Z (vcore) and everest (everything else)? BIOS voltages are not real voltages and are not what your processor is running at.
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