That's odd that I would read your post just after posting this.

I would take it back for an exchange.


That's usually a first sign that trouble is on the way.
One jet I had had the same symptoms. Even lubricating the motor
didn't help. Over time it got worse, even though the plane still flew
by over trimming the rudders & stab to compensate for it, it eventually
burnt out the RX for that motor side.
Not knowing at the time if it was the RX or the motor, I put that motor
on another plane and had the same problems. Finally I wised up and
scrapped the motor.
Replace the motor and retrim the plane. Straighten out the wing and
try flying it again.
If you can't return it, buy another one- at least you'll have a parts plane.