Too bad you already did all of those fixes. I would have sent it back!! Mine had minor warps in the elevators that came out with a heat gun. I've found this to be the case on many ARF's I've purchased. My guess is that on the assembly line they build them nice and true and then they cover them while holding the surfaces in their hands, which can result in a warp if you have excessive wrinkling on one side of the surface and you go heat it up to get rid of the wrinkles.