Unless the wing is fully sheeted in front of the spar, you can twist out the warp. Maybe even if it IS sheeted.

Get some beer cold, and ask a buddy to come over. Have him twist the wing in the appropriate direction and you go over the covering with the heat gun until the wrinkles disappear. Do the top and the bottom of the wing. Once you have both wings the same you are good. On a Cub it is not a bad idea to twist a little washout into both wings.( Washout: trailing edge higher at the wingtip) . I agree with previous posts that in the first picture i t appears that your right wing has some wash-in. Since this is a Cub, the V-shaped struts can affect the rigging angles, so check the wings both with the struts arrached and without. You may just be able to correct the problem with the struts.