Never mind the jerky head in the animation. I just found out that if you use soft body dynamics (Bullet physics engine) to create some chest bounce, the posing dials no longer work on the figure, so I could not fix the animation. The figure is no longer posable once you start the dynamics simulation.
Figure is Dawn. Used soft body dynamics on the chest and hair, and cloth simulation on the shirt. Hope you like it and thanks for coming by!