@Blubber: Why don't you try 4 x blood and take priest shadow with the old shield glygh that heals when it is applied (if it is still around post 5.0.4). With vampiric touch for off heals + blood you should have plenty of heals for most instances. Just have your priest apply SW:P first when you switch targets and your aggro issues should disappear and your DPS should increase as well. For bosses if you can't tackle them with 4 x blood + SP then take priest disc and finish it off.