I agree with Dan.

Two points:
1. Head up in the lulls looking for the next puff. Ride the puff down deep and use it. Jibe on it if possible to ride it longer.

2. Keep your boards all the way down. This keeps flow and the boat going the right direction. I've been passed too many times by boats with boards down going downwind in light air (under 4 knots). This doesn't apply over 4 knots.

Mike Hill