Deluge is slow and takes too much time to connect to peers

I don’t have much advice for you on your current setup. I do have Deluge running on OSMC on a R.Pi2 and it’s working great. Not sure how you installed deluge but the one in the repos didn’t work for me for whatever reason. I recommend you try this:

Deluge for OSMC

Also, I’m auto-starting deluge with cron, not systemd.