About AA's...
Decisive Strikes, Pressing Strikes and Empowered Mending should be maxed and ALWAYS equipped.
Light the Path and Shield of Brilliance is the best combo if you are in dps gear. Two ranks in Light the Path is enough to make it available for every Repulse cooldown. Shield of Briliance get as many points as you can and use it when ever off cooldown when the tank is taking damage.
Put on some heal rating (at least 2000) and you can go with Shimmering Invocation. Emissary *can* be useful in particular fights but in most circumstances Shimmering Invocation will heal more than what Emissary can absorb.