When I bring in a character, I change the joint constraints from "Full" to "ball joint".  The settings then are reasonable, but if further tweaking is needed, limits can be set on how far the joint will rotate. It has to be done for each joint individually.
Ball joint is not just for hips! It tells Carrara that the bones rotate, not stretch out of joint.
You can save a figure in the browser with the constraints modified, to save time in future when importing characters.