So when I put my first set on I used a thin copper washer between the nut and the wheel. I have had them on for some three months now and although they are slightly scratched, the chrome is intact and no sign of peeling.

About the only thing you can do is get a touch up bottle of clear and hit the spots that have peeled to stop it from going farther. Theres no way to stop it completly or be able to tell were it will be next, the problem is something has contaminated the metal and effected the adhesion of the chrome. The rims are going to keep peeling so you might want to start thing of eithe rechroming or powder coating them.