To add to this discussion, would adding casters help with the issue, but reducing the bass, even just slightly? I've considered doing that to my 4x12 although I rarely plan on actually moving it around. My room is about 1/3rd the side of Pete's so obviously I don't have the option of moving it out from the walls. I have amp stands for my smaller combos and have always preferred the sound of them off the floor and angled back a little.
Casters can help a little, if you can find some with thicker rubber treads I would choose those rather than plastic. Head up to Ogden ave. and drop three bucks on some used hockey pucks!