For my part, I would say the best way is to edit the files’ tags in something like mp3tag or TagScanner, so that the files are tagged to your liking. Then you can tell the Agent to prioritize your own tags (when present) over Audible’s.
Plex Dance involves moving the folder (or file) in question out of the space monitored by Plex (that is move, not rename) ; scanning; emptying the trash; moving the media back again; and scanning again.
This forces Plex to recreate all of the metadata it has for those files from scratch, in the event that just a scan doesn’t pick up certain changes. If you only rename the folder or files and rescan, Plex may detect the move since the media’s hash doesn’t change.