
I circled the check boxes I find of use. You can make these your defaults through Preferences.
Required:
1. Remove spaces between paragraphs. That gives it the indent.
Optional:
2. Smarten punctuation. Personal preference to give me pretty quote marks, etc.
3. Transcode unicode characters to ASCII. I've had to use it once before because characters used in a file confused my reader. ... was showing up on my reader as .?.?.? The file still had some issues, but it was readable. I haven't run into this issue with files generated by ffdl.
Before you convert, make sure you delete the cover from Calibre or upon conversion it inserts a jpg of the first page.