How to prevent metadata from bad TVDB matching

[Renoir]

I’ve been experimenting with JF for a few weeks now and figure I’ve reach the stage where I need to ask the experts here in areas where I am still stumped. Please excuse my inexperience. (I’m on JF 10.10.7 macOS Silicon)

These questions are all about TV show matching and metadata.

1. If a TV show does not exist online and JF has matched it to a show with a similar name, is there a way to remove that match? (Like using Unmatch on Plex). I am aware I can use the metadata editor to remove or overwrite the data, but that’s unrealistic for a TV series, since there will be wrong data to remove at the series level, the season level, and for each episode, including titles, descriptions, cast and crew, multiplied many times. All the metadata for such shows is already embedded in my files and that’s what I’d like to see JF use.
   
2. The Library option Prefer embedded titles over filenames seems to have no effect: even when set, I see “Episode 1” etc for episode names when there are actual episode names embedded in each file. 
   
3. If a show is correctly matched to TMDB but matched to an incorrect show in TVDB, I can’t seem to remove that incorrect TVDB match when editing the show metadata: if removed, that bad TVDB match returns at the next metadata refresh and makes JF pull in the wrong metadata again from TVDB. (TVDB is generally useful so removing it library-wide is not a solution.)
   

Thanks for any guidance.