Lamar, my setting to create the ragdoll is basically the same as your, but when a bullet object with 1200 of speed hit the character, all the parts came apart like a distance joint.
LOL- Well that would do it I guess.
If the joints are too far apart they won't make it back together.
So you could simulate the collision using a milder impulse to your ragdoll instead of the actual impact and that should keep the parts together.
OR you could make all the ragdoll pieces stay within a certain radius using x and y positions so they rehinge after impact.
OR you could slow the bullet down before impact using the X and y of the bullet and ragdoll.
You could also play with the density settings of both bullet and ragdoll to reduce impact effects.
I would give those a try.