For the moment, I'm going to assume you're using a proper rotation and have the max ranks (you did train after you hit 80 right?) of all your abilities out on your bar. I was about half way through my first heroic after hitting 80 when I realised that I had somehow put rank one consecrate on my hotbar
Use marks. You should still be marking a primary target for focus fire. Non-aoe dps has to focus something, make sure they're targeting your main target.
Don't forget the casters. I'm don't know your skill/experience so I'm going to state the obvious. A caster that is not sitting in your consecrate or not being directly hit by you WILL start casting at your healer within a few seconds of the pull, even if hit by avenger's shield. Or he will start casting at the AOE dps if their AOE is hitting him and your consecration isn't.
Personally, I don't like your spec. Benediction IS a waste of 5 talent points, and you need 1/2 in improved jusdgements to get a proper rotation.
Use a proper rotation. I can't find a link but search for "969 rotation".