Originally Posted by topquark
@hermil, I think it is inherent to the AZW3 format. I think it's a take-it-or-leave-it kind of deal with AZW3. Me, I'll take it rather than going back to mobi, for purely aesthetic reasons.
I have this same problem. But I like the tightness of the minimal spacing of the MOBI file compared to the AZW3 that I usually just reconvert to MOBI. Alas!