Thank you for this, but, if I understand correctly, you are assuming that the force is proportional to the magnitude of the apparent wind.  But the total force on the sails is proportional to the square of the magnitude of the apparent wind, so the forward force depends on the angle and on the square of the magnitude.  That is the relation that I used for the  135-degree table above.  But maybe I misundertand your formulas and your table.