I have one of these with an OS61fx, and it flies beautifully. The only problem with this plane is when it 1st came out the manual said to glue the wings together while laying flat on your building board upside down. That was an error, this planes must have more dihederal. Make sure you have the latest version manual, version 1.1 , that doesnt say glue the wing together while upside down on building board.
Also, make sure you use 2 wing hold down bolts instead of the suggested one.
Use high torque servo on rudder with pull/pull. thats about it. Daz...