I had good luck heating the wheel (rim) where it contacts the hub. Two things happen, the expansion of the wheel breaks any rust freexzing the wheel and the expansion would give you just a hair's more room. Mind you I'm not getting the rim cherry red hot!

I hate beating the wheel but have when all else fails...usually frustrated enough to get out the 8 lbs. sledge and (with the lug bolts out) whack it....heaven knows the rest of the suspension don't like it!