On conventional airplanes like the Cap, the stab generates lift downward to stabilize the aircraft. The wing center of pressure is usually behind the Cg which would normally cause the airplane to pitch down except that the stab pushes down to balance the forces. It's not likely the stab is stalling before the wing or the plane would, in fact, pitch nose down. The only way for this not to be true is for the Cg to be way aft. More likely, there is an incidence difference between the wing and stab. Might be worth a look.