Argonian +6%
Nightblade +3% per siphoning = +18%
Minor Mending +8% (Healthy Offering)
Sets:
Gold Powered Resto Staff 9%, +Heartland Conqueror to double it +9% = +18%.
Perfected Transformative Hope +8%
Two one pieces of Monster Sets, +4% Each for +8% total
Mundus: Ritual, base 8%. Full Gold Divines makes it +13%.
Total = 79%
In the off chance you have something to Heavy Attack before making repairs, you can add +16% to that score. 95% Healing Done.
This doesn't include resto's low health thing because this was designed for repairing stuff in Cyrodiil, which isn't effected by that perk.
Champion Points: Above can be used anywhere, the below cannot be used in NoCP but can be used anywhere else.
Blessed: +2% Healing Done. (Passive)