I both changed the wing mounts and swapped the wings for much lighter carbon fibre one
http://www.msportster.co.uk/2008/02/22/carbon-wings/
http://www.msportster.co.uk/2008/03/24/mudguard-stay/
Some pics from a recent minor restoration:
http://www.msportster.co.uk/2016/09/...t-restoration/
My original wing stays were hollow steel which cracked after only a short time. I replaced that with solid and adjusted the angles. That combined with the massive weight reduction has made it much better. They still wobble but it's not too bad.