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There are lots of really good advice there. The basic cause is that the center of effort of the wind on the sails and hull is too far aft of the center of effort of the water on the keel, rudder, and hull. You may find that these conditions that move the center of wind effort back, leading to excessive weather helm:- The mainsail may be tuned too full. Flattening the main, and easing the traveler reduce weather helm as wind picks up.- The mainsail may be blown out. This was the basic problem on our '77 h27. A new main dramtically reduced weather helm and heel, while increasing drive.- The rig may be raked too far aft as you suggest. This moves the whole sail plan aft, and is easily corrected. By the way, some rake (3-5 degrees) is good, since winds on the water blow slightly down at that angle to the horizontal.- A large headsail (135, or 150) increases weather helm because a significant part of the sail is aft of the wind center of effort.- As you note, in higher winds, reefing the main reduces weather helm by reducing the aft edge of the sail. If the boat is consistently heeling over 15 degrees, and you have tuned the main, reefing is exactly the right next step.I have not heard of a case where addressing these (or similar) issues has not tamed weather helm on any of the boats on this site.Good luck,DavidLady Lillie