Hmm. I'm using the same heatsink, with the red scorpion fan and my old Thermalright bolt thru kit that came with my TRU. The temp differences you shown are massive. I'm getting around 72C max with my E8500 just like you were getting with your
CPU.
Did the Xigmatek mounting kit arrive yet to see how that one goes? I'm curious if it's any different then the Thermalright. Can you buy that IFX mounting kit anywhere?