Error_401
Thank you but...one cannot compare the angle of attack and lift produced between the upright and inverted wing; they are two different airfoil sections in that sense.
Having spent quite alot of time the other way up in aeroplanes I can assure you that very generally speaking, for a non-symmetrical airfoil, you do want the nose about twice as far above the horizon when inverted as for erect flight (depending on your seating position, of course).
Of course if the camber and Bernouille effect were acting towards the Earth when inverted, you wouldn't be able to fly inverted, that's surely not what you're saying?
If one considers a flat plane, this will create it's max lift when it reaches 45 degrees to the relative airflow. This effect is not considered in the normal lift equation.
So the disappearance of the forward CP at the 'aerodynamic' stall plus the rearward component of the underside make the CP disappear to a point mathematically infinte aft.
Simple really!