On my SVT-CL I run the gain at noon and adjust the master to taste. I have heard using the master maxed and using the gain for final volume makes it sound more like the original SVTs though, will have to try that next time I take it out.
Little weekend project - made a board for all my spare pedals out of a chopping board - works well so far! Need to raise the back up a bit with some feet though I think.
WIsh we got more Mesa over here in the UK! Recently got a TT800, which is brilliant and would like to try a Subway 210 + 115 to go with it, and swap out my SL112s.