Having botched some books (managed to get double copies with some Calibre meta-data work), I did a Voyage factory reset a month ago or so. Books that I downloaded after THAT, even though purchased a long while ago, did come down as .KFX . I had to use "download to my computer so I can use USB to put it on my Kindle" to force a non-KFX version to download. (Not actual terminology.)
JHOWELL, have you tried going to your Kindle as a mounted device on your computer, and deleting ALL the parts to that particular book? That might force the next download to bring it down in a new format. Maybe?
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