What engine are you using? If it is the 41, then you can get away with a little less right thrust. Also, remember that the designer drew the plans for the average pilot in mind. If you have a lot of time with heavy, taildragger warbirds, then you could get away with a little less right thrust. Are you a good enough pilot to fly the big Jug with rudder only? If you never use the rudder in the air, then I would leave it alone and build it according to the plans. If so, then you could take out some of the right thrust. The original had right thrust. The full size Corsair had an off set vertical fin to counter the thrust problem.
Brian