Ath, I like the look of your books, I also really care about readability and good setting out, and I generally re-format most of the books I download. I personally would have a little less margin (I was looking at Sir Leslie Stephen: Social Rights and Duties), and there's something weird in your page numbers, c (1 of N), what is the c for?, but other than that, they look really good.
(Oh, I totally agree about abandoned lines on an empty page, hehe, I HAVE to do something about them)