Hey Metal6string: K100s are Celestions but they are 8 ohm speakers, so you should check whether your v30s are 8 or 16 to avoid problems.
Snowdog: I have the v30 cab for 3.5 months now but never really played at loud volumes so maybe you might be right about the breaking in.
sdhnc123: I use 6 KT77s currently which I swapped from EL34s and they are really great but I liked EL34s too.
Laura: My setup when I try 2 amps simultaneously is guitar into a pod hd500 then pod left out into Herbert fxloop return, pod right out into Engl fxloop return, herbert fxloop send into left pod fxloop return, engl fxloop send into right pod fxloop return, pod fxloop send (is a stereo out) stereo Y cable split into 2 mono goin into Herbert and Engl inputs. It sounds fine this way but with less bass.