How about reefing the main sail? Reefing points can be added by most sailmaker and they should help alot.

If the mast in inserted in the sail sleeve (Laser 1 setup) you can roll the sail around the mast a few times to reduce the sail area. If the sail is inserted in the mast track (regular catamaran setup), you will have to modify it to install a reefing point.
I know that I used to sail with a Hobie 16 in pretty rough (windsurf) conditions and reefing the main really made a huge difference.



Charles Leblanc