You'll find it is a lot easier to fly the osprey if you use "Thrust Vector" instead of rotor tilt or wing folding, since the osprey uses neither. Thrust Vector is also what you use when you fly the Harrier or the F-35. Try that instead.
I have mine set to the slide on the throttle. If you do that, I'd also suggest selecting "reverse" when you assign it. That way 'back' is hover and 'forward' is forward movement.