I think the pitch up you might get when you get close to the stall is caused by the centre of pressure moving forward. As the airspeed gets slow the air across the surface loses energy/momentum and the higher pressue air behind it will push forward making it seperate from the wing, so the front of the wing is generating the lift and thus creating a moment pitching up...
(just a student also but fascinated by this stuff)
(also I suppose when you stall you're normally pulling back on the column more than you ought to be...)