[romad]

Well, I first tried Kindle Unpack because of a single author. For some reason when I bought his books on Amazon, after converting from AZW3 to ePub starting on the second page of every chapter, the text block would shift one character left on each page, which made the book unreadable. However, when he sent me a copy of the ePub he provided Amazon, it did not have that character shift. He and I could never figure out what was causing the shift. Kindle Upacked ePubs also didn't have the problem.

So I'll continue to use Kindle Unpack just for his books but convert all others from AZW3 to ePub in Calibre. It is way less labor intensive than editing the CSS.

Thank you for your suggestions, though.