In IMAC the wing MUST STALL in the manuever. The judges watch for the front of the plane to suddenly drop down. If they see an abrupt pitch upward before the spin, you loose points as you snapped the plane first to force it into a spin.
That is perfectly true. I got zeros all the way because I slightly cheated the stall.
What I don't understand is why my plane does better spins in windy conditions. Visually, a stall in the wind just seem to be a deeper stall than a stall with no wind.