OK, I've been playing with the metal colour on the skin, trying to get a balance between the red, green and blue that looks right. The following screenshots were taken at the same arena time and from the same viewing and sun angles to eliminate as many outside variables as possible.
First the original metal colour, too green/blue:- RGB 127/138/145
Next the colour shifted away from green/blue and towards red, possibly too purple:- RGB 130/135/140
Finally the in-between colour that looks to be the best balance to my eyes:- RGB 128/136/142