Yeah it does sound simple. I managed to do that ...
But my real question is what this means about the air flow over the back 1/2 of the sail.
Also - to remove with the leech line creates more hook and I had understood hook to be not good.
HAd seen this before with more wind but only on last 1 foot of sail and more rapid flutter. This really looked like the ripples in a slowly flapping flag and was approx last 1/3 of sail.