Calibre and online sites can convert from PDF to Epub usually lose most of the format. I tried PDFElements, with similarly poor results.
Is there any service/app that actually works and converts a PDF to Epub in a way that resembles closely the original?
I had a same issue for my kindle. What I realized what the source pdf should be good. For example I used to use 1-2mb pdf size for conversion, but it used to break in text or alignment. Now I pick 10+ mb sized pdf instead. Essentially people who make heavy weight PDF files save it as full adaptable file size without reducing its qualities.
Hope this works !