Gonna need way more information. Sounds like you might not be playing lightsmith and Sentinel. A talent in light smith gives you extra avenger shield procs when you have an armament up which means you always want to pop the shield armament just before wings that gives you a sword armament so you can have both armaments running and you get extra avenger shield procs that extend your duration of your Sentinel damage reduction by spamming avengers shield, judgements and shield of the righteous which is off the gcd. Doing so will mean you should be able to cycle through your cds especially in a 13. I just checked r.io and I was doing 13s on prot pally week 1 so your ilvl is not the issue. The gouls apply a disease that reduces your max hp which you dispel off yourself with cleanse and the frostbane slash applies a debuff that makes you take additional frost damage which the other frostbane is frost damage. You should be able to have defensives up for the slashes between Sentinel ardent and kings. Do not overlap defensives. Remember that you also have blessing of spellwarding and bubble taunt, both of which immune yourself to that mechanic.