Driveline "bind", or drag?

Hi Joe.
It has Moser BBP axles with 10X2.5" brakes. The shoes measure 2.5" wide.
It's almost as it the wheel has put a "crown" on the drum after the lugs were tightened for some reason.
I'm using wheel vintiques Mopar repro steel wheels.
I ground a chamfer onto the edge of the shoes and it seems OK now, but I'm afraid to really crank down on the lug nuts. They're tight, but I usually run them a bit tighter.
I guess it'll be OK, but I just never heard of such a thing happening. It was fine with the Weld Prostars that were on it before, and I tightebed the hell out of those lug nuts.
Thanks for the help.

George