wind range for 155 genoa on a cal 2-29

Getting ready to do my first race in my cal 2-29 this weekend on the lower Chesapeake bay. Not a novice racer, just never raced my 29. We will be sailing w 6 on board. I have an old kevlar 155 and an old dacron 130. The wind is supposed to be 15-20. What wind ranges do you racers carry the 155 and do you reef the main first before going to a smaller jib or to you change head sails early. My gut feeling is it will be 135 weather, if for no other reason, I doubt the old kevlar will last long in that kind of breeze :) ...any input? Thanks, East Coast Cal 29 sailor. 628