No ideas on Bryce importing. As for the shoulder, it could be that you made the arm go forward by using only the shoulder dial. To achieve a more natural look, you should try to allocate your whole movement between the several locations involved. Here, for a total move of 90 front, I'd give a 20 to the collar and the rest to the shoulder. Make sure also that you keep the other dials (twist and side-side) as low as possible for the effect you seek. The less you push the dials, the less the geometry deforms.