Did you radius the brake pads?
I had this problem with a fresh carrier rebuild years ago. Turns out I had everythign adjusted to spec, but the new brake pads had high spots so they did not touch the full length of the pads. A truck brake shop took the drum and checked the radius,t hen mounted the shoes and applied a latch to trim the pads to have the arc match the brake drum.
Fixed the problem.
Only needed if new shoes have been put in. "original" brakes may just need cleaning the pads.
Hope this helps.
Jim
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