the main sail needs to be fully loaded, head to wind wont do it. did your mono have a backstay? the main acts like a backstay upwind, thats where the jib wire tension is coming from when youre sailing. thats why it needs to be adjusted for different wind strengths. the tighter the main is sheeted the more tension on the jib wire. a tape gauge placed on the mast next to where the jib halyard wire ends- near the base of the mast, when you have the jib up and tensioned- can give you a reference. set it up, sail out , go hard upwind, and look at the forestay-jib wire . is the forestay slack? ok. are your blocks almost kissing? perfect! mark the height of the jib halyard wire on the tape gauge on the mast. if not perfect, mark it anyway and use it as a reference for adjusting the halyard. fall off onto a broad reach, or go back to the beach. have your crew or you re- tension the jib, tighter for less rake, looser for more rake. one inch increments of adjustment is plenty. repeat until its correct (jib wire tight, forestay not loaded), sheeted in hard and blocks almost kissing. write your estimate of the wind strength next to that mark. now youre set! looser for light air, tighter fot heavy. ok?