From what I've seen the problem is the rotation of the mast is controlled by how tight the main sheet is. If the lower batten/boom isn't set up right or if the main sheet isn't hooked far enough forward on the clew plate the mast seems to be over rotated all the time.
I agree with this. When Skip and I sailed the boat, I don't think we ever got that lower batten set right. It was a real PITA. However, both Bill Roberts and Tom seem to defend these quirks ardently, so who knows. They certainly don't have these issues on their boats,
