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If it is a shoe problem, the shoes should be arced to the drums and if needed, the outer edge can be beveled some if interferes with the radius in the corner of the drum. If it is a drum to backing plate do as Jim suggested or have the drums turned to remove some of the outer lip where it fits into the recess in the backing plate. From what is shared, I get the impression that at anything over 40FP the drums are ether binding on the shoes or backing plates preventing them from turning. (?) My OP is shims are a last resort and if installed; only use one per side. If two are needed, make a single out of thicker steel shim (DO NOT USE ALUMINUM OR BRASS) stock instead of installing two.