@ebookreadr -- I think at least *part* of your line-break problem might be in the Nook itself, although Nook may have fixed their firmware by now. I remember a long discussion about spans and small-caps that might give you some clues
https://www.mobileread.com/forums/sh...d.php?t=232395
Take a look at post # 26 by Hitch for some discussion about the Nook trouble.