Your description is not clear. Is the wing twisted, or is it not level to the fuselage? If it's the former, then the heat gun process above will fix it. It will fix tail pieces too. I have a Kaos that came from the factory all banana'ed up. It's straight as can be now from a couple of sessions of twisting and shrinking. If it's the latter, don't worry about it. Get the horizontal stabilizer straight with the wing and the vertical stab perpendicular, and it will fly fine. Sanding the wing saddle is a fix for when you realize that the horizontal stab is not level to the wing and you can't remove it to fix it.