Prot Pally Help!

So, I've recently started tanking for my progression group and we're currently stuck on Xhul'horac and I was looking for some advice on how to improve when it comes to the fight and my rotation. Any help will do. Here's the logs and my armory.

Logs: https://www.warcraftlogs.com/reports/VfxmwJ2Pbj8qFgXh#fight=17 Armory: http://us.battle.net/wow/en/character/wyrmrest-accord/Rhykkar/simple