I don't doubt what you folks are saying to be true. However, attempt to explain why an airplane would pitch down with flap deployment. From an aerodynamic standpoint, down flaps, increases the AOA of that portion of the wing adjacent to the flap/flaperon. Increasing AOA should cause a pitch-up, not down. The aircraft's reaction should be the same as up-elevator. Again, I'm not calling you liars! Just interested in this phenomena. My guess is it must have something to do with icreased down-wash from the wings with the flaps deployed.