Its me again! Mine are going in just the same places though not quite as bad as yours. The front edges of the wings have effectively no protection so maybe not a surprise. I've got one side rubbed down and patched with cold galvenising spray and probably attack the other tomorrow. I was intending to buy a colour touch in kit and see how (bad) it looks. I agree that a decent stone chip covering is the way to go but matching could be a pain. I may buy a small spray gun and see if I can get the paint. Best of luck and keep us posted.
Have you had a go underneath yet? Mine was almost bare of underseal on the passenger side and was getting quite rusty in places. It was a filthy job but looking much better now!