One quick advice regarding squaretops. Don't pull the head in to the centreline. Try to sail with a nice continious amount of twist. The top should nearly always be about 200 to 250 mm out from the centreline. You'll need this twist profile to reduce pressure on the top and to cut down on the tip vortex which can add alot of drag to the rig. Pulling in the sail to tight will feel like the boat is bound up. That it should go alot faster but won't. A squaretop that is too far open (twisted off) will feel underpowered, you'll be sitting in and going slow as well. Finding the right twsit profile can in some cases feel like you just dropped a large chunk of lead. The boat will feel free, agile and quick again. Remember induced drag on the rig accounts for about 30-35 % of the total boat drag and it is the single biggest drag component in relation to hulls drag, board drag. It can make or break your race quickly.

Wouter