I run a 3" longer forestay and 1.5 " shorter shrouds. In 20 knots plus, I'll run the forestay in the top hole. If the wind drops, I'm screwed. My measurement usualy is about 20" or so back on the rudder or about halfway down the transom. That's what JC told me to run it when I got it. Maybe I should stand it up a little more since I rarely win any races.