If it's just the chrome finish worn off, the road blast of crap from the front wheel will tend to do that, even with a FFE. Sand and road grit will wear it some, mix that with water and you have a powerful abrasive tool. Have you ever seen a waterjet cutting machine? They'll blow through solid steel using only sand and water.
If they are actually making contact, you should see some damage from the impact, or hear noise when they hit.
How about some pictures? We're all a little confused about what is actually happenin here..
Dave
GWBBA #9