It occurred to me simply to do a hard drive search for "ORIGINAL_EPUB" which brought every one of them up in my finder, and then delete. Of course, they remained in my Calibre library but I figured out how to "fix" that.
I've reloaded the three books I'm reading after a factory reset, and now I'm recharging - again - to 100%. If the drain normalizes then I'm looking at a situation where whatever book it is that's causing problems is corrupting the Kobo to the point where simply deleting it isn't sufficient.
Might be best to just to epub-epub convert the entire library before I start reloading if that's the case.
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