You can try
tex4ebook (I am developer). It uses tex4ht to convert LaTeX files to xhtml and then epub or mobi.
Regarding formats, for technical documents is great epub3, which has unfortunately bad support in e-readers, but it supports mathml for math, svg for drawings etc. You can see
epub3 sample converted with tex4ebook. For old epub and mobi, it uses png images for math and drawings.
I can help you with the conversion if you want, I need some real world test cases and in case of full book there will be probably need of some customizations.