The Tube Comp works WONDERS in front of the Ac30. I also like to adjust the Bias and Bias X all the way up and make it real saggy for those "dangly" mid-high voxy crunch tones. I use the 2x12 silver bell with the 2nd dynamic mic (can't remember the model) with the E.R. set to pretty high. Throw a plate reverb at 10-15% mix and dial down those Basses a good bit and it's magic.
I have also grown fond of the studio EQ at it's default setting as well.