Here's what I've managed and will be intent on getting 100% 24/7 stable. This hung after about 3 hours of blending on ~384KFFT length, but passed the 12k test. CPU is still failing at around 12K on the small test though. VTT is only at 1.3v though so I'm thinking a bump to around 1.32-1.35 might help this, would you agree?

Running GTLs at all +50 seemed to even out the timing of all the tests but it restarted at around the 3rd round of 12K tests. Currently testing at 50,10,50,10 to see what the difference is, then will bump up the vtt. If I do this, how should go about adjusting the GTLs accordingly? Would an increase in vtt normally require an increase in GTL refs on 65nm, or is there no certain pattern?