Struggling with Dragonknight PVP healing

Does anyone have any suggestions on how to be a more effective Dragonknight healer? I am struggling with keeping allies healed like I can on my templar. It feels like all of my healing abilities are inferior. Cauterize doesn't heal for much, obsidian shard heals for a lot, but it has to travel and doesn't heal if it misses the enemy, and ash cloud is poor. Skills like healing springs are really hard to use sometimes in battlegrounds if there is movement, and magma shell is expensive as a defensive ult compared to templar support ults. Additionally, I feel like I go through magicka way faster on my DK than on my templar

Is it possible to be a DK PVP healer? Or do I have to give up my dreams (DK healer is my main goal in this game, I feel a connection to it, not to templar, but it seems templar is the only viable pvp healer?)