The early hulls have a much larger hole in the deck for the mast. I figure
J/Boats had not yet figured out how they were going to set the rig up. Most of the racing tune suggestions have to do with reducing lee helm by having more rake, inducing more weather helm, thus step forward, headstay max. Your rig sounds plenty tight, the question is do you have enough weight on the rail for the amount of sail area you have up. Several times over the past month we have raced Wed nights with five people and well under 1000 lbs. Keeping the boat flat makes a big difference beating and can help reaching. If you don't have max weight then you must drop the traveler down, put backstay on, or use less sail area.
