I'm far from an expert heliheads, but it would seem a little up trim in upright flight would become a tendency to dive in inverted flight. I had my Pizazz set at 3 3/4" and don't remember any excess trim. It's now at about 3 1/2" with the new engine, and again the trim is not excessive. I feel with planes like the Twist and Pizazz, perfect trim or a tendency to climb or dive in level flight is not too important anyway. I'm always on the sticks and after a few flights, the corrections are automatic. I don't even think about it.