I am NO expert by any means. I'm thinking that he had just dialed in the sweet spot on the 4*. I think most planes have a "sweet" spot. You may have to move your CG around in order to find it. I'm pretty sure that a planes spin characteristics also lend itself to how readily one will spin, and how flat. Usually full up elevator, and full rudder gets the ball rolling. Then a little opposite aileron to flatten it out. But as I said, I'm NO expert. What are you flying anyway?

Jim C.