I have the same plane it's ok its supposed to be there the wing provides so much lift that they angled it down to off set. If you've ever taken any real flying lessons you'll no what is meant by "more right rudder more right rudder" as most flight instructors are yelling it as your taking off on your own for the first few times this accounts for the fact that the down swing on the propeller is acting more efficiently than when it comes up giving you more thrust to the left which r/c counteracts by angling the motor to the right.