When I sail in heavy air with the jib I can get the jib halyard tight enough to remove all the wrinkles in the luff of the sail?
Above 20 knots you want the luff of the class jib smooth with no wrinkles. To get the halyard tight enough sail downwind before the start with the backstay off and have two crew pull up the halyard. This should get it tight enough. Be sure to get the jib up BEFORE you tighten the backstay at the leeward mark.