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okay well! it appears I've found the issue. just for reference for any future viewers.
i had already cleaned most of it off, but went back to try to take a photo of the issue. in the attachment you can see on the fixed part of the drum circled in red that has some tape residue or corrosion or gunk of some sort that had fixed itself there. just cleaning from the outside and the heads wasn't sufficiently reaching in between that tiny gap to get that junk out.
so i scraped a bit off with some tweezers and then got in there with some IPA again. distortion is gone!
so it was hidden gunk. its really true... just make sure the thing is CLEAN.
thanks y'all for guidance
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