Ed:



Forget trying to use the mast bend to run your rotation. The rig bend characteristics are way more important than how the mast rotates or doesn't. Se the mast up for the proper sail shape and then identify the shortcomings of the rotation control system. If there is not enough boom compression then move the boom bail for the mainsheet aft to increase compression force on the mast. An inch or two is usually all it takes to make a big difference.