Mast rake is about the only way to alter the Cl on a beach cat other than easing the traveler. Altering the Cl defintely changes the helm. The P18 does have a heavier helm than the other Prindles even when your are sailing it right. Prindle put really long rudders on that boat to keep the angle of deflection low and prevent stalling the rudders. The 16, 18-2 and 19 have short little rudders by comparison.
Jimbo