Pretty sure the ones buzzing your dekes are sandpipers and/or curlews. Snipe don't usually fly in flocks, and usually jump up when you jump them up on the marsh, not out over the water. I could be wrong about what you're seeing, but that's the way the snipe act down here. I've rarely seen more than doubles, but do see big flights of pipers buzzing around all the time.
Give a man a fish and he eats for a day. Let a man vote to give himself a fish and he eats until society collapses.