I've had the same experience where Calibre dual-mobis don't always deliver AZW3 to my Kindles, but KindleGen so far does. I'm toying with switching to KindleGen as my primary conversion tool.
Paul1977, can you elaborate on the table of contents issue you've run into? Is it a problematic NCX file? Missing HTML Table of Contents? Something else?
Put another way, I always make sure my epubs validate before I run them through KindleGen, and I'm wondering if that's enough, or if KindleGen can still have problems with a valid epub. Thanks!
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