The deck needs more ways to win, right now it's only way of winning is swinging with a sunblast angel a ton, which isn't going to happen even with your amount of draw spells. Basically, you need to hit your opponents more. Here are some recommendations:
Gideon's Avenger (Synergism with tapping, but also procs whenever opponents attack you HAHA)
Frontline Medic (Awesome Indestructible+Board Wipe shenanigains, but only if you have enough creatures.)
Transcendant Master (EXPENSIVE)
Augury Owl (Good poke/fly chump block and scry to set up draw.)
Niblis of the Urn (Only if you're using Gideon's Avenger)
And if you need more defense vs. aggro, I recommend Fog Bank.