I am not sure that I agree with your way of looking at it. I think it comes down to the boats ability... not equilibrium(granted I do not know any boat that can safely sail in 150 knots of wind). I can not think of any boat that has as much freeboad/mast and standing rigging that equils the amount of sail area possible. therfore there will never be equilibrium from that. Your forward momentium is driven by your boats ability to stay perpendicular to the water as the wind increases your ability to stay up in return decreases your power in your sails which will slow you down.
Schock - New York 36