:O. That's because your radiator can't take advantage of high flow/SP fans. I'd like the delta's a bit more if setting 1 on my pump/res didn't still output 30dBa.
I wish your thermal diodes worked (fully). It would be nice to run a comparison on our loops.
^ in light of that, have you tried different temp reading programs? SF, HWM, Everest, REALTemp, and a few others I can't remember the name of.