It took me a long time to decide what is the best format for me. LRF books are working fine but there is no WYSIWYG editor for these. Now I'm editing all my books in MS Word and print them to pdf with the best font (size) for my eyes. Is not as fast as LRF but is ok and it looks great on my reader. I have uploaded a book to show it to you. Please try it and give me a feedback:
https://www.mobileread.com/forums/sho...707#post548707