[JimmXinu]

Originally Posted by A_Reader

Second, the site used is AO3 and I'm using the ReaderEra Premium App which let's me toggle the spacing a bit but always changes it for the entire work, including the title page. If nothing else works that's fine.

This is one of the (many) stories I'm working with:
https://archiveofourown.org/works/17...pters/40005456

Is this was you meant by story URL?

Yes. That story uses normal <p> tags for paragraphs. Some use <br> tags instead and are generally handled differently.

FFF's title page specifically uses <br> tags to keep the title page lines together.

If your reader is treating both <p> and <br> the same, then you may need CSS.

Or you may want to look for additional settings in your reader first to save having to change all your epubs. I know in KOReader I had to set 'Style Tweaks' > 'Paragraphs' > 'Generic web browser paragraph style'.

Originally Posted by DNSB

p {
  margin-top: 0.5em;
  margin-bottom: 0.5em;
}

DNSB's advice for Conversion is fine, but it is advice for Calibre's Convert as opposed to getting it in FFF to begin with. The CSS maybe what you want, though.

Originally Posted by A_Reader

Bulk conversion another option, if it's not possible to add the extra css to the personal.ini directly. Thanks for the detailed explanation.

You can absolutely change CSS from personal.ini. Here's an example that will add DNSB's CSS:

[epub]
add_to_output_css:
 p {
  margin-top: 0.5em;
  margin-bottom: 0.5em;
 }

Note that each line after a setting that starts with a space will be included as part of the setting.

FFF can be extensively customized. Here's CustomOutput CSS and another about why I suggest 'add_to_output_css' instead of just output_css.

Note also that FFF only updates epubs on download or update. Once you change a personal.ini setting, it will only affect downloads/updates after you've changed it, not existing epubs.

FYI, A_Reader, as a new user, your first 10 posts or so need to be approved by a moderator before they appear. Just post once and wait rather than reposting. Thanks.