They have been experimenting with a "bigger" working sail rig for the mossies here. Personally I'm not sure that it is the way to go. I look back on a few other classes that went down that path a few years ago and it caused a lot of problems in them which they have never recovered from. Adding a bigger rig where the mast, rigging, sails, boom etc have to be replaced has nearly always proved highly detrimental to the class (not to mention expensive). Now improving the performance of the class by simply "adding" another sail and leaving the rest of the boat alone seems to be a much better way of improvement for all.