Side skirts color match issue

GonGo

On my PW the front an rear bumpers were a little off (whiter shade) since purchased. Since I had them repainted because of minor scuffs they are somewhat now off and have a denser clear coat than the rest of the car. Pearl White metallic particles don't seem equally as dense on non metallic surfaces, I was told they magnetize metallic surfaces while applying the metallic coat. My rocker panels seem to be a shade darker or more yellow thrown into the mix, i have seen this on most stock PW 370z, so it doesn't bother me that much.