Let us know what your 4.2 and 4.4ghz voltage and temps are. Looks like you might not have a hot running chip afterall.
I think I've found my stable 4.2 settings, but I've yet to run Prime for several hours and I haven't even tested LinX or IBT yet. Conversely my vCore could be a bit higher than needed.
All power saving settings, C-states etc. are on default/auto. LLC at 0%. Offset voltage at -0.030. BCLK 100.00, turbo multi 42.
I've got two front 120mm 1700RPM fans, one rear 120mm 1300RPM fan and 1700RPM 120mm CPU fan.
Door closed, all fans at the lowest speed (~50%): 73c, 72c, 71c, 75c
Door open, front fans at ~50% speed, rear and CPU fans at 100% speed: 64c, 68c, 65c, 66c
I'll test with 4.4 later on, I have a pretty good idea of what settings to use.