As I said in the my earlier post, the first issue is whether it's the hanger or the mating area on the frame that isn't flat. If the hanger pocket in the frame isn't flat, a new hanger won't magically solve anything.

Though the hanger should, and as a practical matter must be aligned with the wheel on (the wheel's the reference), that compensates for, but doesn't actually fix the problem of poor fit. Even on a frame costing a small fraction of this one, I'd expect the hanger to pocket flat, and not move when the wheel is tightened.