I like it.Looks like you started with a white, or really light grey as a base.
I would try this, Make another layer above it/all medium gray, and set it to overlay or soft light, and adjust the opacity. This will add some grey to it, without have'n to edit the metal layer itself.
I have no dought, that at some angles, the metal would appear bright like that. The problem is, when its in game, and the sun hits it at different angles, it will be blinding. Has to do with the games built in sun reflections. Basicly, anything white, will be very, very white once in game.
Or something like that. I'm no metal master, still learning myself. Its something thats very had to pull off. And almost imposiable to please everyone. Everyone has their own opinion on what looks right, and what doesn't.