I am having a sailmaker cut off the bottom of an old main to make something that will behave in 20 knots. Cut off too much and we'll have lee helm, so, how much to remove? No change to the jib. The main has reef points (Schurr) but sailing with those the boat can still be overpowered. This is not for racing- this is just for going out and having fun. My best guess is, 6 or 8 inches past the reef points. Has anyone got experience with this??