This is one of the main reasons I'm not a tone chaser. Also why I know that the SVT is, and in all probability will remain, the finest amp I ever played through.
I've come to enjoy the tone I get at home but never chase it in a gig. Too many variables Rooms vary, ebb and flow of bodies changes things, sound engineers make you sound how they like it, and different mates or band members giving you the nod in a pub soundcheck have their concept of levels too.
And most importantly what I hear won't be what the audience hears anyway.
The SVT by the way just sounded awesome in every single setting.