Focused Rage is worthless, since with shield specialization your at 100 rage at all times.
Rend? worthless if you ask me and get armored to the teeth atleast and move 2 points from improved disarm to gag order.
I dont see another spec. The spec youre using is just bad in so many different ways. You say rend is a personally choice and that is fine, but why do you even use rend to tank? It is a loss of dps and tps (don't get all technical and say during movement encounters blah blah, I know those things. Im saying over all it is not worth it).
You spec into cruelty over AttT which is bad. You spec into Iron will over imp Heroic Strike - Bad. You spec into Focused Rage and not into Gag Order, another bad choice. While I applaud people who stretch the boundaries and try different things than the masses, some things just need to be taken and are not really a good choice to skip (gag order as an example).
No worries. And I just re-read my last post and I sounded dickish. I didn't mean it to be and it seems like you didn't take it that way either but just in case, sorry for it sounding that way.
The only bad thing i can say is that you use Corpse Tongue Coin which is in my opinion one of the badest tanking trinkets out there you should better get Juggernaut's Vitality/ The Black Heart/ Unidentiable Organ/ Glyph of Indomitability