DK Endgame TankingFollow

I'm level 80 and currently specced like this. I have 28k unbuffed health and about 24500 armor, 30k or so with Unbreakable Armor up. I'm far from a tanking expert, I've never done it before this character which is why I specifically wanted to play it as such. I had no issue tanking regular 5 mans, and now that I'm 80 I've tried tanking a few heroics with mixed results. Oculus and Nexus went smoothly, Halls of Lightning tonight was interesting to say the least. I need to run it again a couple times to see if it was just me or a bad group, but it was a bumpy experience.

The first boss, the General, was hitting me for a lot and occasionally while in Berserker Stance would hit me for over 10k health. We killed it on the first attempt and with it's lightning buff active so I suppose I did alright there. We failed in about 8 attempts to kill the last boss, every single time it was our healer who was dieing. This ultimately led me to believe he was just a poor player and maybe he was the reason the run didn't go too well.

I never have issues keeping hate, I just wonder what stats DK's are supposed to stack to be able to tank endgame things better. Those Titanium something mobs in Halls of Lightning were really doing a lot of damage to me, even with Icebound Fortitude up. Is Heroic Halls of Lightning meant to be difficult? Again I think that group was just bad, I was first in damage dealt and I'm not really specced to put out huge numbers.

So the reason I'm asking this is because the other day when I ran Heroic Oculus, someone asked me what my defense was and I said 453. He laughed and said "You can't tank heroics" and booted me from the group, I've had other people looking for tanks and I offer to go and they don't want DK tanks. Later that day I ran Heroic Oculus with some other people and it was extremely easy.

My health is 28k unbuffed and 24k armor, defense is 453, parrying is usually at about 22.68% with the 5 blood talents, and 28% or so with Unbreakable Armor up. I'm considering using the Glyph of Unbreakable Armor. At 24k armor I reduce 61.69% damage, at 30k armor with the UA it reduces about 66%. I'm not certain but I think the additional parry seems better for us while tanking. In those situations when I'm getting pounded Unbreakable Armor doesn't really stop the pain like Icebound Fortitude, so I would think boosting my parrying another 5% could be a good thing.

Its late and I'm rambling, but yeah. Any thoughts would be appreciated. Good night!

28k in health?!? I'm really looking forward to lvl 80.