Having had some time to think about it, I don't think letting go of the brake would immediately cause this - when I let go of the brake the bike nudged forward a bit and the pegs swept my feet out which caused my 250lb corn-fed ass to land on the seat, which made the tire catch enough traction buck up like a stallion on meth.
Finally got the bike back from repair (almost 3 weeks and $3100). Was happy as hell and (like an idiot) paid and took off fast as I could. Was hooking up BD43's headlight mod last night and realized they didn't replace the fairing stay....so the whole front fairing is still tweaked to the left about an inch. I'll admit it's not that noticeable but I would think a bike mech. should have a little better eye for this than I.... If I don't get it fixed now it'll bug the crap out of me until I do it myself so it's going back again..