To clarify my comment about idle detent; N1 take time to spool up when changing from prolonged idle to TOGA. This is another consideration when a/c is falling out of the sky and flight control is urgently needed e.g. Habsheim incident - low total energy, low N1. The impression I got from the airbus test pilot was that stall testing is done in a very controlled manner changing flight controls as little as possible. This protocol allows the a/c to return to the flight envelope very quickly with only small stall excursions. It's not cutting engines, full stick back, see what happens.