FYI, I never test out chrome finishes in the customization screens. Chrome needs an environment map to be really effective, and the customization screen sucks! I've seen ParkYongLee use the showroom to show off a chrome finish and that seems to work. I test out all my liveries out on track on a sunny day.
You may have actually done everything right, and it just looks wrong in customization. I did a quick test with the racenet livery and it works fine. My advice is to stay away from adding chrome to flat surfaces... it's not very effective IMHO.
View attachment 476524
in game... ( with a chrome helmet borrowed from one of my other mods)
View attachment 476525
.. using the below spec map. ( it's a really crappy map slapped together for this test in like 30 seconds.... and you can see the nasty logo outlines on the car. You will do a much better job I'm sure with your final mod. )
View attachment 476526
Cheers