I know this might not help for end game as I am still leveling myself, but I use a combination of templar skills and restoration staff with a nova ult.. however I haven't fine tuned my healing skills yet as I haven't unlocked everything.
The 2 main skills I find myself using for over time healing in dungeons currently are:
Grand healing and regeneration (resto staff), with Breath of Life (Rushed ceremony) as a lower life savior.
Sun fire as a damage spell along with nova ult, and random skills for leveling up other trees on the remaining.
If you are having difficulty with healing off those 3 spells, you can always take the less dps route and put the rite of passage ult in place of nova, which will basically guarantee you never let anyone die as long as they don't run away.
Hopefully that can at least get you started
This post was edited by EvilCorpse on Jul 4 2015 12:17pm