Hi Kaz,
Yes - I certainly remember the same, and rubber band powered balsa wood planes too. Also we all know planes can fly upside down, so IMO (unscientific as that may be) the curve more determines the smoothness of the flow of air and where it breaks down relative to the AofA thus assisting the lift, rather than actually providing lift. I could be entirely wrong, but while my plane continues to fly I don't really care......
Cheers,
Neil