I need to find out some data comparing voidwalkers and felguards for purposes of instance tanking at level 55. I'd like to complete BRD before it's too easy, but at the moment it's too hard, I'm wiping quite a bit. Doing affliction dot dps slowly during a boss fight, the voidwalker can't hold aggro off the priest in a few tough fights. (Disc specced, using PS with max points in threat reduction).

Does anyone have info on the following:

How much threat does the voidwalker generate with untalented torment, vs the felguard taunt?
How about talented torment? 3/3 in improved voidwalker?
How much armor would a voidwalker have at 55 compared with a felguard? Health?

Any info would be appreciated sir.