I cant say i agree with Ed S.
Ive only raced mine once and got a second, to another 37c.The biggest performance change i have heard of is a larger headsail. about 125% seems best to thouse who win and take out the cutter rig all together. Now i havent done this but thats what Blaise Pearson swears by and he should know. He has won boat of the year on the west coast of florida several times with his 37c. He uses performance sails and all the goodies, but has raced his for years very sucessfully.He is on the owners list and would problbly offer some good suggestions if you contact him.My favortite book is Sail Power, by Wallace Ross. It is a great book on trim and how boats work.ED