Originally Posted by JSWolf
Deleting the CSS is going to make the ePub a mess. I suggest taking out the option to delete the CSS. You WANT/NEED the CSS or you will lose most if not all of the formatting and have a lousy reading experience.
I think you have way more experience with this than I do, but my experience so far doesn't support this. In every case where I've gone in and carefully edited the stylesheet, the ePub still looked nasty, so I've gone back and nuked the stylesheet and then it's been okay.
And the reading experience anyhow is often less than perfect. I've got one pdf book, for example, that just comes out unreadable no matter what after conversion and fiddling around.