I am the new owner of a hunter 29.5 1996. This is my first boat with the spept back spreaders and yesterday was the first day in brisk winds. 20+ kts. I noticed that when closehauled and heeled about 15 degress if the main or the headsail began to flutter as I got too close to the wind, the spreaders would vibrate fore and aft at about the same rate as the flutter. Is this normal? I know I was overcanvased and later reefed but it was rather disconcerting to see the spreaders moving about.