I modded a larger main for my 5,2 by removing a strip from a cross cut area where the leach and luff were almost parallel. Maybe that's an option for you too. I admit I only did it because a proper sail for a 5.2 is more expensive that my whole boat is worth...

That worked very well although the dacron sail (leach) is too weak for serious racing when the wind picks up.

Thicker sailcloth would have been better, but beggars can't be choosers. In general it works well and gives me more speed downwind without aggravating the handling too much. I can even use it 1-up but have to let out 2 to three feet during the tack to prevent it from going into irons.