Just realised I never posted the results I got when I diced my PSC the 2nd time - 6 weeks ago .
Here is my result at 5.5GHz:
http://hwbot.org/submission/3133246
And at 4GHz:
http://hwbot.org/submission/3182792
One side of the dominator pot seemed to need more topping up than the other so my mount may have been off (used lots of elastic bands). The temps also seemed to differ by 10C-5C depending on which side or end I measured at - so something wasn't right. Thermal paste used was Arctic MX-4, but I didn't put any between the pot and heatspreaders, so...
This was at 2.25v I think and I could tighten most tertiaries down to 4 (not WRRD_dr) and reach loop 12. However, I spent ages trying to get 5GHz to pass, so I was running out of time and dry ice by then - this was a bit weird as the same IMC and RAM volts were used for 5.5GHz and 4GHz which both could finish with wazza, but 5GHz would never pass even without wazza.