Put a F16 pole and spinnaker on( I used an early Stealth, FX1 is about the same size ), I did about 4 years ago and it worked very well, made what was quite an underpowered boat, to be quite fun down wind, set the tip of the pole quite high and you won't pitchpole as you would expect, the spinnaker will generate lift as well as foward drive if you angle it enough.
<img src="http://www.catsailor.com/forums/images/graemlins/smile.gif" alt="" />