Hey. Great build. There's something about seeing a large array that get's me hot and bothered. 😅
Regarding the way you're downloading and copying files over. Are you still looking through your trackers and adding renaming manually?
EDIT: I was reading through your thread when you posted your update.
Yes, regarding automatic downloads. There are plenty of way to achieve this. Since you're using trackers I recommend give this from Trash Guides a read (he has a highly active discord if you have issues / get stuck and they're a lovely bunch of people) - not affiliated, but honestly he covers so much more than what I could here for you. I would say he's pretty much the go to right now to getting your ARR's setup, hardlinking your directories with instant moves (atomic-moves) and more importantly for you, creating highly customisable lists to specify inside radarr and sonarr exactly which files types, codecs, file size, and names you're looking for, all automatically. All you would need then is OMBI or any requestarr app and you pretty much wouldn't have to touch radarr or sonarr again.
I'm quite like yourself and incredibly fussy with what I download. I do recommend moving towards usenet. This will definitely broaden your searches and you won't have to deal with download limits from trackers. It's an easy life and greener grass on this side, pal. I used to torrent, but no more! He covers that somewhat in the guides.
Sonarr actually does this itself. If you select the series in sonarr, click monitoring at the top and then set to all future episodes. This will then only download all futures releases as soon as your newshost, trackers as it. You'll then see this in the calendar in sonarr.