Kemii, dude, for the first time in my life - what the actual ****??? Are you serious?!
You're tanking a HC dungeon boss with 23k HP in a 78lvl PvP crafted set, you're getting absolutely raped, that boss is caving his fists in your skull with every 7-8k hit, and you're advocating for Blood tank? Were you drunk when you posted this or what??? The only reason you survived this was you used all your cooldowns, even AoD, and had a Disc Priest basically spam-healing you. Jesus christ, man...
Frost doesn't need avoidance, unlike Unholy for Bone Shield. Frost has less self-heals, but more avoidance and more mitigation. There is absolutely no problem for a Frost tank to tank any WotLK content. I really really don't remember ever dying to this boss on my retail FDK tank back on 3.1.
@lanrien & psychephy -
Here you go. Balanced Blood DK tank spec. Morbidity allows you to use D&D in every pull. Rune Tap and Mark of Blood are both good, especially when used well. Even if you don't like them, there's not much else you can pick in the tree, honestly. Bloodworms and Improved Blood Presence are crap, Vendetta is for leveling, Spell Deflection is weak, Butchery and Scent of Blood are useless because you don't need more RP, Subversion is a pure DPS talent, Dancing Rune Weapon has its own aggro so it's useless for tanking.
If you want, you can go
Blood-Frost hybrid (like most scrubs will tell you to do), but then you won't have Morbidity and your threat will be significantly lower - all for the price of 3% more avoidance => GG.