Need some help - Slate Metallic Powder Coat Match

I've got a chrome bumper that I'm planning on powder coating before installing on my '08 DC. I really love the look of color matched front ends. I've also got a Rock Warrior grill that will have the surround color matched.

My local powder coating company ordered a few colors, but nothing came very close to matching the Slate Metallic finish of the truck. I'm wondering if anyone has had a bumper (or something else) powder coated to match a S-Met truck, and if so if you could share the brand/color with me? The colors we found that looked close on a slick were way off once we got a test plate. I appreciate any insight you might have.

 

@G__T T Might be easier to order a plastic one and have it painted. Plastic bumper covers are pretty cheap.