Well, firsy of al, I think you did an fine job with what you were given to work with. It looks the part.The paint does look a little over-scale; if you're looking for the best metallic paints out there, Model Car World's metallics are ground to scale dimensions, and mixed from actual color chips. They're superb.
This kit was obviously rushed out with the cheapest investment possible up front, and intended only to snare modelers who wanted a curbside model. It's sad, to me, that in this day and age with the technology available that AMT is not putting out top-quality models. Having just gotten into car modeling in the last two years, I"m shocked at what Auto modelers have to work with sometimes, compared to Armor kits. There's not even a comparison.