Same here. When i was tanking the 3 drakes in Sarth3D, if our feral tank died, Sartharion always come to me because of my superior healing aggro compare to healers probably due to frost presence (but it was with the RIP blood aura + bloodworms + deathstrikes so a lot of self-healing).

That is not been unlucky that is your healers having you nearly always at max.

Beside that, i also think that for a tank the healing component on death strike is not that important, not "healingwise" neither "agrowise."

I'd have to say I disagree 100% with the last line. I play unholy tank and my 3-disease Death Strike heals are around ~6.6k. I cannot undestand how instant near 7k heal can be "not that important", specially when you can chain up to 4 of them in a row if needed. In the current content there are so many places where I can/will help my healers (hard modes/speed kills require minimal amount of healers) with that: Hodir's Frozen Blows, Mimiron Plasma Blasts, standing in fire while soloing Ignis constructs and the list goes on.

I can think of numerous situations where we for example have had healer die for some reason and I've managed to stay alive with Death Strike healing (with ERW) and Death pact giving me 100% of my health back in 5 GCDs while a healer has been combat ressed. Of cource such is not needed if everyone always plays perfectly and RNG is never agaist us, but things do go wrong sometimes and for those situations Death Strike healing can be a very powerful tool.

You have obviously never tanked Vezax hardmode, where healer mana is a precious commodity and you need to go out of your way to prevent them from overtaxing themselves. Death Strike is one or the primary reasons (along with IBF) that a DK tank is used so prolifically on that fight.

If you compare paladin holy light overhealing(78%) to death strike overhealing(85%) you will see my point. Bigger spam heal got lower overhealing so death strike healing was unlucky.
If we look some other Algalon parses we should see trend.
WoW Meter Online - Combatlog Replay 66.6% over heal.
WoW Meter Online - Combatlog Replay 57.3% over heal.
WoW Meter Online - Combatlog Replay 53.5% over heal.
WoW Meter Online - Combatlog Replay 51.1% over heal.
WoW Meter Online - Combatlog Replay 66.4% over heal.
WoW Meter Online - Combatlog Replay 80.4% over heal.
These are all top 25 kills where blood dk have been main tank.

Been reading a while and I also agree that Death Strike overhealing sometimes doesn't generate the threat but in my opinion in the long run your saving the healers mana. Would be interesting to see a threat comparative of Obliterate Vrs a max healing Deathstrike. If the obliterate comes out ahead might be worth while to play around in frost and pick up some more RP generation for those fights where mana isn't an issue but agro is.

off topic uestion: I have been running as a blood tank for some time now and have yet to see anyone with a talent tree like mine. It seems to work wonderful for me but I want to ensure that it can hold it's on on content past 10mans. Could I get some pointers or advice on my build if it's not to much trouble? My biggest point of contention is that I give up will of the necroplois for Frigid deathplate.

Very rarely are you saving the healers mana; rather your heals generally act as mitigation of a sort, helping your healers catch up to large spikes of incoming damage (Fusion punch on Steelbreaker) or times where damage is coming in at an incredibly fast rate (Mimiron's Plasma Blast, regular attacks in Thorim hard mode at 10+ stacks, Hodir's Frozen Blows). Think of it this way: Until the point at which your healers top you off at 100% after such an onslaught, you're essentially gaining a temporary HP buffer equal to the amount you heal yourself with death strike. Of course all DK specs have access to death strike, but I feel that blood's constant use of it, plus the fact that it actually does some pretty fantastic threat, to be one of the build's biggest strengths.

You did 262,608 effective healing to yourself over 513 seconds, or ~512 health per second. Healing threat is 1 threat per 2 effective health restored, so your base healing threat was ~256 per second. According to WoWWiki, Frost Presence's threat modifier is 2.0735; that means your heals generated a total threat of ~531 per second over the course of the whole fight. For the time that the animus was spawned, your healing TPS was halved and applied individually to both Vezax and the Animus (heal threat is divided evenly among every mob that has you on its aggro table).

That's assuming the "Effective Heal" column means non-overheal healing, of course. I'm not familiar with that particular parsing site.

It does count healing that actually heals. Blood DKs have the highest tps on GV.

In a game like WoW, if you build is vastly different than anyone else's, you are likely doing something wrong (in this case, you miss a lot of good talents like Will of the Necro and lots of threat talents for 3% melee miss).

You've made a lot of unusual decisions in your build. My biggest concern would be your threat on high dps encounters: 2/5 Dark Conviction, no Bloody Vengeance, no Might of Mograine, no Blood Gorged. Yet you do find the points for Spell Deflection and Bloodworms. It seems like a fairly "defensive" tanking build. I also wonder if aiming for Frigid Dreadplate in the Frost tree forces you to grab too many filler talents along the way.

It works great, very high aoe burst and decent substained.. problem is its very situational. Most occasions where aoe tanking is needed in ulduar there's a constant flow of mobs incoming, therefore unholy is superior.

With the nerf to UB for tanking as unholy, frost with the HB glyph might be the alternative.