I have the same issue man. I've had blms in groups that do nothing but AOE and it just makes it so difficult. I try doing my rotation shield lob[1]->flash [group]->fast [1] -> savage [2]-> RoH [3] -> flash [group]. Then I spread out some shield swipes to 2,3 and spirits within on 1.

It still doesn't seem like enough sometimes. :/