Rampart should be used practically on every pull. You have Sheltron as PLD, and that is easy to proc as you should be using Holy Sprit to do damage with Requiescat up and not Clemency. Always plan on using Hallowed Ground more than once a dungeon, get the big pull early and pop it to let the healer DPS to their will. You'll have it back before the whole thing is over for another use.

Let the healers do the healing. In-fact you are making SCHs job harder using Clemency on yourself, it messes up the Excog proc which is at <50% HP.

You'd be surprised how many low-tier paladins are out there in DF that think they are good trying to be a "healer" but they are really doing low damage, and messing up their mitigation which is why they are getting hurt more.