Yeah...with the quality of gear you have, your avoidance is dangerously low. You could just be logged out in threat gear, because I have a hard time believing that you tank with that little overall avoidance.
But, I would definitely recommend that you get [item]Sunguard Legplates[/item] and gem it for +10 dodge rating and +15 stamina to get the bonus. Overall, you just need to run a little more BT and pick up more gear out of there. As Madocks said, as long as you meet the raid zone minimum for Sunwell you shouldn't have a problem when you are fully raid buffed.