You want a little Right thrust in the engine along with down to make the plane fly good. It should be just enough to see with the eye. If it is more then you will have to fly with alot of rudder to keep it in a line. You can add washers behind the mount to get the desired amount.

The 40 on a trainer is fine. It would get off the ground quicker with a 46 but at the same time would probably fly nice with a 35



LATER and good luck!!