FWIW I've found the only way to get a good conversion from PDF is the labour-intensive one: export the PDF as text, load the .txt into your favourite text editor, use extensive search & replace to eliminate hard line endings etc (or perhaps less search & replace if you have any competency with regex, which I don't), convert quotes to “ etc., and finally turn it into a decent epub with Sigil. Loading into Calibre is then of course a trivial exercise.
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