Try using a razor saw to cut a line on one side of the joint (the side you want the wing to move to). For example, if you want to lower the left wing, cut the line on the lower surface of the left wing. Now, gently press the left wing down - the kerf of the cut should allow "room" for the wing to move. See if that provides enough bending to align the wing properly. If it does, re-cement the lower joint. You'll have to do some retouching with paint. Hope this helps!