The only way I know to reduce weather helm is by raking the mast forward. By raking the rudders forward you can remove the symptoms, but the boat will still not be in balance.
Not true, not true, not true!
Regardless of where the mast is, the shared loading on the boards is the same. The mast being more forward will make the boards cary more and less on the daggers, but the total force will be the same. By raking the rudders you move the center of effort on the rudders closer to or further from the pivot point in the gudgeons. So, in essence the torque is the same, but if you feel it or not is the difference.
Adjust the mast for speed/power, adjust the rudders for helm.
