I did Cathedral 40-41. The only problem I had was with mana. For some reason I couldn't get ES off to interuppt the Priest's heals. She out lasted me on mana. But her and the Paladin hit like little girls. The trash mobs monks and abbots hit way harder. You want to down them first.
I believe if I had times the ES correctly, Cath would have been a breeze. I opted to continue questing instead of repeatedly runnng it.