000 Umask didn't work for me either. I just installed not too long ago binhex Sonarr and Nzbget. I thought it was configuration problem at first before I skimmed through this thread.
My NZBGet currently is downloaded to main cache drive (/mnt/user/appdata/data) and Sonarr moves it to (/mnt/user/appdata/media/series) array. It seems un-archiving task keeps looping, it restarts after un-archiving. When restarting container, it's finishes fine. Will probably move over to SabNzbd if other nzbget containers does the same.