I tried the things you mentioned,
VTT upped and
MCH a notch or two, no difference.
I had to increase
Vcore to 1.415 and it was stable at 3.5GHz [390 *9] for 8.5 hours, before core #3 flaked out.
It was the temps that has made me rethink, 65Deg....is this not too nice??
In my AMD clocking past, this temp was the edge of tollerance and not to be broken, still the same rules apply here?
What should my working max temps be for my Go SLACR?
Just in case I do damage, I have gone back to 3.45 GHz but can be used all day every day max temp 58 Deg