Thank you for the info. The images are already at 85% "quality" (whatever that means, I have the feeling that is program-dependent), so I don't want to further reduce the quality (even if it's the same number, recompression just means enhanced artifacts).
Lossless compression is of course a good thing, and I had applied it... only that I didn't use the "-progressive" flag, that apparently calibre does, and it allows for saving the extra ~5%. However, I don't think that justifies a new upload, but I'll save the reduced files so future updates will benefit from this.
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