I'm having a strange problem with my FS and hope someone can give me a few suggestions. I have a snug rig with North sails. Crew weight is about 320 lbs and we're sitting on the rail. I find that in winds over 15 kts, not only am I overpowered, but the boat develops lee helm. i.e. when I heel too much and try to feather into the wind and let out the main, the boat "falls off" rather than "heads up" and I have to push the tiller to lee just to keep it from continuing to fall off. Finally when the wind puff lets up the boat finally heads up. In heavy conditions I have the boom vang tight, the outhaul tight, the Cunningham tight, and the jib lead blocks as far aft as they go. The board is all the way down. I've had some near capsizes because of this action (and of course it slows me down), so I'm quite concerned. In light air the boat sails like a dream. Please help.