Another thing........... (another aerodynamic difference)

Take a look at the wingtips of both airplanes. Your 4* has a semi-symmetrical wing. The airfoil is a "lifting" profile. That means the wing will lift "up" better than it will lift "down". So when an airplane with a lifting wing is upside down, the wing isn't going to be lifting like it did right side up. The plane will head for the ground unless the pilot pushes in some "down".

A lot of airplanes require you to fly the airplane in the roll with more than just your aileron stick. You have to do more than just whack the stick to one side or the other. You often have to use some down elevator as the model rolls through the inverted parts of the roll. And some airplanes need a little bit of rudder when they're on their sides in the rolls.

Have you flown the 4* inverted? The "down" elevator is obvious then. And airplanes with semi-symmetrical wings will often take more down than others.

The Twist has a symmetrical wing on purpose. It's supposed to fly upside down a whole lot.