I use the Copper and Zinc Profile from Great Plains Laboratory. Normally, either the free copper is high and/or the zinc is low. Generally, using additional zinc seems to help. The problem is determining clinical benefit versus many of the other supplements being used. I can see it high, but I can never say exactly what is happening when we start supplementing against it.
I agree about the hair copper. In fact, I have seen this exact same thing where the hair copper was high, but the serum copper was low.
Dr Woeller