What has been most effective for me has been making sure to know when damage will be inc so I can pre-shield the group. If the whole party is missing health, I use PoH + AA (like mentioned above, keeping Solace on CD so you can pop AA when needed - it makes PoH worth it!) . Just a few and I will throw in penance or flash heal. It is definitely not mana efficient and if I get behind, it can get rough. Really what it comes down to is the pre-bubble. Not flooding with bubbles all the time, just to clarify, but just covering the group (or specific players) before a damage spike.
Glad you have found the replies helpful! Best of luck