The cable attach point is a compromise in every sense. Too close to the top & you have no moment from the pivot point to raise the keel easily, too far from the top the cable comes out of the hull at too much of an angle. I think mine was about 1 ft below the pivot pin hole.
I put mine 1 foot below the pivot point as well. Nice that we coincide without talking! Certainly make me feel better about my hack job