What's the best way to sail down wind in light air...say 4 mph? (I know, super light...)
I then tried to sail further down wind, almost to the point of gybe, traveler out, weight forward, kicking boom out with my foot, standing by the mast, laying across the middle, none of it seemed to make a bit of difference and I couldn't get anything going.
At 4 mph wind speed, I'm not sure what you mean by getting anything going. At max speed (less than 4 mph) the sails will not be filled and the rudder will leave little if any wake. Perhaps you we're going near to max speed and didn't realize it. As the others wrote, heading straight downwind is likely the fastest route because gybing repeatedly while gaining 1 or 2 mph on a broad reach isn't worth it.