I've been reading that the DTS on the Brisbanes is broken/inaccurate/etc. Could be why I can't get an accurate reading?
Also: I used a thermaltake fan controller to run the fan up to full speed (~2500RPM). The temperatures remained nearly the same on all of the temperature monitors except for Speed Fan, which showed a temperature drop from 23C at 1200RPM to 15C at 2500RPM.
I am going to trust Speed Fan on this