I don't know how high your 2" spacers actually are, but I've been throwing around a similar idea, except that I have the 2" OME springs. The way I figure it, 33" is just a 1" difference in radius from 31"! My tires do rub up against the inside of the fenders at extreme flexes, but that's nothing some bump stops won't fix, which you should already have with the BB!