the goal is maximum mast rake. the limiting factor is the mainsheet blocks. the jib halyard controls the rake. the forestay needs to be long enough to allow the mast to rake back far enought so the main blocks are almost touching when both sails are up and you are actually sailing. use additional shackles or a pigtail of cable (mine is about 6" long) to lengthen the forestay. higher wind strengths require more tension on the jib halyard. when you are sailing upwind your mainsheet blocks should be almost touching each other and the forestay should be just slack, with all the load on the jib. the side stays should be slightly slack on the leeward side. too much tension on the side stays makes for poor mast rotation. hope this helps!