Originally Posted by kairos
First I convert to PDF then using calibre convert to Mobi.
Tried a few different fonts about size 12.
The basic problem is with the formatting when reading on Kindle ie line spacing w, sentences flowing across line spaces and justification of texts paragraph flowing into each other
Forget about PDF. Converting from PDF to anything else is always going to be iffy. Save the document as RTF or 'filtered HTML' and use that as input for Calibre. It'll work much better.