I know there's a lot of posts about frost tanking, but bear with me as I add yet another.
I've been an Unholy tank since forever, and I've never had trouble in heroics keeping AoE aggro. DnD IT PS pest ... BB and then I could take a nap while dps killed them. But I've heard unholy isn't any good for raiding in 3.3, and since I've recently joined a guild that raids, and finally got into ToC I decided to go Frost (I don't like blood tanking, I was traumatized very early on, don't want to talk about it...).
Single target threat went up, no question about that, but I'm having trouble in heroics on trash, after the first mob goes down the dps gets spread out and they often pull the other mobs off of me. I have the HB glyph so the rotation I'm using is DnD HB BB then I just try to keep my blood runes on cooldown, use frost strike as a runic power dump, and hit HB whenever it's up. If deathchill is up I hit that before the first HB that helps too.
Heroics have suddenly become incredibly frustrating, so any advice on my spec or rotation would be invaluable.
Also, I seem to have way less health than tanks with a similar gearscore, opinions on whether this is actually a problem and what I can do to fix it would be appreciated.
My current spec:
Talent Calculator - World of Warcraft
The World of Warcraft Armory