Michael,

I agree with the comments above except that I know very little about spinnakers.

Mast rotation upwind in light winds is an interesting problem. You need enough to let the wind flow around the lee side of the mast but not too much so that the airflow stalls. Before the start of a race try altering the mast rotation with outhaul, downhaul and mainsheet set in one position and see what difference it has on your speed and power. You may be very surprised with the results.

I remember doing this on an A class cat and the results were astounding. The A class has a wing mast so the results were magnified. Simon also had some comments on the forum about the time his rotation control line broke in light to medium conditions and it felt like the Mozzie just took off.

Try to remember what settings you had that gave you the best speed and power for the wind conditions. Good luck with the experiment.

Regards,

Peter