I'm not a test pilot, engineer or mechanic.
I'm a pilot. It was more than 17 years ago, but I have a hard time imagining I used ailerons for a spin entry and I have an even harder time imagining how that would cause the nose to PITCH UP and go flat. Last time I checked, ailerons affect ROLL not PITCH.
Anyway, I have no idea about the mx history of those airplanes, I'm just glad I don't earn my pay flying them any longer.
P.S. Have a look at that study posted by embraerman.
Be lucky!