I love spinning... some planes will flatten out nicely once they're rotating by -easing- out the pro-spin aileron. Take it out too quickly and the spins stops.
Others go right on down into the ground. These have the c.g. too far aft.
My racing HOB T-6s suffer this way. The "good" c.g. for racing is too far aft for violent manuvering.
Going from up to down elevator can change things in an interesting maner also.