I had this same problem on my Ohio SU 26 with a ZDZ 60. As I played with it I kept taking out throw till I could pull full up at any speed and it would not snap or roll out. This ended up being ~3/8" up and down. I did not think this would be enough to fly the plane but I can still pull 75' diameter loops and it does awsome snaps even with this little bit of throw. The same for my 30% Edge but I can use almost 1/2" before it will start snapping out of a tight loop.