Okay, back home, found my notes, which are possibly dated, so there may be some overlap with what @jackie_w just posted:
Code:
Speaking of fonts, if the UI and the ACCESS (KePub) reader mangles some styles with custom fonts, make sure the Panose stuff is sane (OS/2 > Panose).
Keep the usual Kindle line-height tweaks in mind, that might also help w/ the line-height < 1.0 issue...
c.f., https://www.mobileread.com/forums/showpost.php?p=2866441&postcount=218 for the line-height thing,
and https://www.mobileread.com/forums/showpost.php?p=3606469&postcount=2 & https://www.mobileread.com/forums/showpost.php?p=3608181&postcount=9 for the Panose tweaks.
Also, supposedly kerning has to be old-style for the ACCESS renderer to make use of it...
Keeping in mind that I generally go the extra-mile of murdering the extra space between lines, hence the line-height mentions
.
(I'm happily using a patched Bookerly this way).