Keep force armor up at all times. Keep your HOT rolling on the tank. Be efficient with your heals, if you see the tank is only missing a little bit of health, don't waste 40 force or whatever Deliverance costs, instead use your free Benevolence, or even wait a few seconds for the tank to take an extra hit so that you are getting the full effect of Deliverance. Just because the DPS lose a little bit of health doesn't mean you need to waste force healing them. Often times they'll lose a little bit of health from a bosses AOE, but they aren't actually being targeted so they just lose the initial chunk of health and don't lose any more for a while. Obvisouly if they are losing enough that they are going to die then heal them. One of the bigger things....Your job isn't just to heal and do nothing else. You need to be paying attention to debuffs that you can dispel and you need to interuppting boss casts.