Update:
Temperature went down here so the last days been working on the brakes again.
Rear end up. Brakes adjusted with very little drag. Put wheels on and lugs tightend. Both wheels turn free in the air BUT !! left wheel starts dragging after 20 to 30 turns backwards...turning forward again runs free.
So I thought: mostly driving forward so out for a testdrive.
Result after 10 miles with absolutely no hard braking: hot drums and wheels! (190 F). Jacked the car up and wheels turned heavy. Losened the wheel lugs a bit and wheels turned free agian ??
I'm totally stunned and don't know what to do anymore.

Shoes are arced and leading and trailing edges are tapered...