Hey I have seen a bunch of videos of the skippers holding the mainsheet downwind while sailing with a spinnaker especially in f18s.In know you want to support the mast and all with the chute up but they are easing the mainsheet what looks to me as if they were pumpping the main downwind. I usually center the traveler and sheet in tight as if I was going up wind and dont touch the mainsheet at all just steer. Can someone explain the how this works and does it work about the same as upwind. Sheet in for power , ease in puffs??? thanks