Well, figured out the issue with temps, and it was a first world problem that did it.
Late last night remounting the heatsink with the Kryonaut thermal paste. For the first time in about 15 builds, I tightened the heatsink screw to the mobo too hard and snapped it. So I was fucked last night. I got onto Amazon and the only two heatsinks that could be delivered between 7-11am today were the Thermaltake Peerless Assassin and the Noctua nh-d15. All the others would be delivered Sunday. So I didn't want to downgrade to the Peerless Assassin from the Phantom Spirit, and I didn't want to be without a PC until Sunday, so I sucked it up and overpaid for the Noctua, which got delivered this morning at 10am.
Well, installed the Noctua this morning, idle temps are 43-45. UNder full load in Cinebench, 80 degrees, vs 84-86. Also as I figured, fan noise on the Noctua is a noticeable improvement.
My Phantom Spirit must have been defective.