Hellow,
I am very interested in your project. I have 5 Year experience in designing of epub, mobi, Fixed Layout ePub Conversion, fixed layout kindle. I always deliver project on time with quality. I have done more than 10000 books.
Does the pdf have images or tables? how many pages for these books? I use Sigil and Dreamweaver to do epub. The quality will be better than auto software.
Regards,
Bruce