i have a problem with the jib on an 87 capri 18 i just bought. the jib is on a cdi furler and it seems no matter how i sheet it the top of the jib luffs violently the minute i try to sail upwind. i bought a new main, as the old one was original and blown out. the jib however looks pretty good and has had sunbrella sewn along the foot and the leech. im wondering if the sunbrella is screwing up the sail shape and causing the luff problem. the previous owner has not responded to questions at this time. do you think i could remove the sunbrella without any ill effects to the sail? the boat is trailer sailed and is garaged when not in use so the uv protection is of little consequence.