OEM metallic paints

Since most of my modeling is replicas of previously owned 1:1 cars I use factory OEM colors. I am currently using urethane single stage touch up paints with a urethane clear coat. I am still experimenting with this combination. Urethane can be tricky and peels easily.  I find that the metallic content in these paints are on the heavy side when viewed on my model. Just too much metal flake. The paint really pops but I would like to get a more correct look. What are you guys using for metallics ? Do Scalefinishes or MCW have a heavy metallic look when finished ? I have not tried them yet. Here are two examples. Plum Crazy and Forest Green. The photos exagerrate the metallic  more than in person . Maybe I am searching for too much perfection ?

Source: http://cs.scaleautomag.com/SCACS/forums/thread/1003365.aspx

Piers Courage Chris Craft Jim Crawford Ray Crawford Alberto Crespo