Perhaps the VO crown races are too hard/brittle?
I went through a similar thing with my '78 Grand Jubile - found a NOS replacement fork, but of Vitus 888 and longer blades/different geo.
I didn't want to have to replace the headset, as I like the look and adjustment of the original with the black top nut.
Very pleased with the ride, even with the altered front end, and got lucky that my headset was in such nice shape.
I can understand wanting to change due to aesthetic issues.