While I like the idea, I must ask something that has bothered me for the longest time, and I may just be lacking information.
The feats that involve ripping people's jaws, limbs and spines off all assume that the muscle strands, cartilage, veings, nerves and everything else act as ropes that keep said subjects in a firm position and fight in unison against any form of applied force. While that is mostly true, the way it is done feels wrong to me. Realistically, assuming of course that you manage to pull against said limb without the person coming with the pull, if something pulled with the force that we are assigning these values, individual muscle strands would tear pretty quickly and exponentially weaken the whole support massively. At the moment it is hard to give exact evidence to what I'm saying, but it should be simple enough.
Evidence aside, am I missing something here? Because, tl;dr what I wrote, the things that are assumed to pull against anyone attempting to tear off stuff would not act in unison and would individually tear up, particularly if the character did any form of twisting motion and changing the position of the target during the pull, even slightly.