I seem to be asking lots of questions before I get answers. sorry 
When you:
sudo systemctl stop cgminer.service
sudo systemctl disable cgminer.service
sudo systemctl enable bfgminer.service
sudo systemctl start bfgminer.service
Does that permanently use bfgminer when MinePeon reboots?
When you:
sudo systemctl stop cgminer.service
sudo systemctl disable cgminer.service
sudo systemctl enable bfgminer.service
sudo systemctl start bfgminer.service
Does that permanently use bfgminer when MinePeon reboots?
Yes, but when I did it, I had to modify bfgminer.service slightly to make it work