I can’t follow your work flow as it seems to be the as mine but with 3 folders it just doesn’t work as first write does that as it always write to the first location listed so everything would write to /home/plex/move based on your config.
My workflow/use case is really identical to yours so if you aren’t getting my workflow or how it works, I’d work on that as opposed to trying to figure out how make it work with 3 folders as my setup does not work with 3 folders.
My use case is that I download torrents and keep them on local disk. I seed them for however long I want and eventually they get removed or stay depending on my ratio groups and how I have it setup. Torrents are always local as I don’t think GD is a great use case for torrenting.
My Sonarr/Radarr/Plex at the end all point to my GD as that is a great use case for it. Once a download is completed, it is hard linked and loses any relationship / need / anything for the torrent area so if the torrents are deleted it doesn’t matter.