Not sure if this is the solution, but I've had my power rack for about 4 days. I play a lot of high-gain stuff, so the sound in both FOH and thru a cabinet is crucial regarding consistency. I've turned off the cab output for the monitor out. But for the main out (FOH and DAW), it sounds much better with good quality IRs, instead of the provided cab from the profile. Setting the IRs in the rig mgr is a breeze. Takes away all that fizz up top.
Tue Madsen rigs and IRs are phenomenal. I haven't tried the Celeston IRs yet.