Hi Lowflyer
You could consider, although some what retrospective, fitting as i have, a rubber mount between the hefty front wing stay and the wing. I used what halfords call a mini exhaust mount, its a 1" rubber bobbin, it may absorb some of the vibration induced stress.
Have removed the wing stay and wondered why there is no shock absorption, except a thin rubber?
Started rubbing down with 240grit thinking I would hit aluminium quickly but no, had to gouge out 2.5mm of filler but luckily no crack in the superform, see photo

Can anybody recommend a good 2 pot filler for this type of repair?
David 2001 4/4 4 seater