If the warp is bad I would probably make a jig to hold the wing in a position where it is bent true and then beyond a little and hold it there and apply heat from a paint stripper or covering gun, LOTS of heat. Be warned that dipping it into a bucket of water may cause other warps that u don't want. Use a sprayer. Have a hot iron filled with water close by so u can apply steam to the worst places. Let it sit untill cool, an hour or two. Remove from the jig and check it, let it sit for a bit and check it again, repeat if it warps back, do it over and over untill the warp is gone and it is holding it own true.

Also like gray beard says, twist out minor warps with the covering and a heat gun. ie: force the warp out and use the heat gun to shrink the coering while yer holding the warp out.