Ok m8 as far iam conserned to both played aspects dps-tank for guild needs i can say a few things,
OK i took some time to search your stats your gemming ,enchants.So 1st of all i think having so low hit is bad.You still question your self why outbreak misses.
O.64% hit is pretty bad dont u think?
Why 0 60+ stamina gem?Tbh thats not a problem cause like this dude here
http://us.battle.net/wow/en/character/i ... ros/simple wich is actually one of the best dk tanks in the world.
Still i think the only prob u may have is the hit.That may hold u back and u loose outbreak or aggro.
On the other hand the talents i would just say since u are in a 10man choose each talent with patience.U may need another spec for each fight.Sometimes more dmg sometimes more survivibility.
I actually a pretty good geared dk with progression.I dont find a way why u should actually have a problem on your tanking.
If u have problems on survavibility test your healers.Maybe its their fault u dont live long enough.As dk u should have problems like this i still believe we are the best choice in certain encounters.
Now about rotation,Outbreak heart strike death strike for healing (save cds for tough phases)rune strike choose wisely between rune strike and death coil.Anyway synti and nize should know better.
P.S Sorry for my english.