I was reading about rust issues causing problems between drum and backing plate, that is a new one on me (always thought noises originated from drum/show problems. Anyway, that is something else to think about in this case.
The shoes ride on little pads on the backing plates. If those contact areas are not lubed they can cause hanging issues of the shoes causing noise. Those little pads need some lube. A dab of silicone "Stay Put" is my suggestion for those areas.
