Zara

I was told you use the glyph for the shield, and then use it when players are injured to boost heals

Before you delete the toon, I would say at least try disc and/or shadow. No reason to waste a perfectly good toon. I found when I tried holy, that I also had problems keeping up. What are you using for your level 90 talent? For dungeons, I've found that halo works if you can get to a good place to use it. I always use it whenever it comes up, that may help. Also, keep in mind that many random dungeons aren't doing mechanics. That can make it harder for you to heal.

I'm wondering if anyone has played around with the level 100 talents? I have been having a hard time healing tanks up, throwing everything I have. Then I changed into saving grace, the weird thing is, it works.