After successfully patching my Libra and experimenting almost the whole night with different formats and fonts, I came to the conclusion that I have to wait for the custom font sizes patch. I just could not find the perfect font size with any font, default or sideloaded. (I use custom font sizes on my Kindles too).
I also tried epubs, to see how much better the typography is. Unfortunately I found several annoying bugs. Several sideloaded fonts which work perfectly with kepubs and on Kindles, didn't work properly (or at all) with epubs (yes, they were .ttf files). Often there was a very large gap at the bottom of the page, for no reason I could discover. There was no mention of widows and orphans in the stylesheet of those books. I didn't have the energy to delve into the whys and wherefores, so it was back to kepubs pretty quickly.
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