Sometimes when I use cover with shield oath on with one stack of medals, I get killed while using it if my HP isn't max. I could use Hollow Ground but you won't have it all the time and most of the time when you are covering a burst from a coordinate team, you won't be able to clemency yourself if they stun you.

So I propose a buff of getting a 10% damage reduction while using cover on a target. It will make you have a 35% damage reduction with shield oath assuming you don't take safeguard. Also, it won't cause a heart attack to your healer when your hp goes from 100% to 20% while using it.