Stiffen your ragdoll.
Right now it’s jello instead of human.
Making it the right stiffness will already reduce some of that shaking/twitching.
And is there an animation running on it? Use anim debug to make sure there isn’t. If there is. Obviously set an animation state where it just has a 1 frame animation during the ragdoll stage.
Haven’t worked with chaos and ragdolls btw - if you are on the latest engine this could very well be a new feature 
(Also, I suggest you prevent the joints from overextended entierly. Yes they do normally. But it’s prone to issues no matter what physics engine is in use. If you only allow them to bend the “right” way it prevents wierd falling and unnatural poses).