Did you also paint your grille and the chrome pieces under the lights? Or just the LSC moldings? I tried painting my door handle after it broke and a month later it started to peal off. It might be because I didn't prime it but I did buy one from ford dealer ship and it looked like it was already primed. You mind going over your processes again and where you bought your paint supplies from? There are sites online where I was thinking about buying the right color code and going that route.
From what I have gathered, you have to apply a adhesive promoter, prime 2 times, spray paint 3 times and clearcoat 2 times...