Are you using the features of KFX? I'm only asking because I do not and wondering if you're worried about wanting those features in the future.
For me my biggest obsession is getting ragged right margins. With the Kindle I can turn that on in the settings for KFX books. But I also download the books from the web page rather than using the send to thing, and then convert the AZW3 file to EPUB, then convert it back to AZW3, and tell calibre to use ragged right (left) justification and to remove spacing between paragraphs.
Using ragged right margins can give the rendering machine more wiggle when laying out the page without having to use obvious big spaces between words. Which is an issue for me because I need to turn up the size of the text.
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