@fiveten - Thanks Spiros, it definitely needs to be closer to the 'correct' color.

@garybrantley - Thanks Gary, I do have that .pdf. I actually considered having a custom spray paint mixed. There's a shop close to me, but I really thought it would be easy to find something close.

@beauslx - Thanks Robert, I think this is going to be the way I go. Instead of buying more cans of spray paint, I'm going to bust out the airbrush and mix a custom color... I think.

@chinesegeorge - The shade of blue definitely depends on the lighting the car was in at the time. So many pics look so completely different. There are also recommendations to use AS-26 Light Ghost Grey... It's close...

Even though the paint result is very good, Brian @brithebuilder, I do fully understand you want to get a closer match.

I also think this means my airbrush needs to become a far more normal part of my workflow. The finish is absolutely smooth, there's not even the smallest amount of orange peel visible.
My color is definitely a darker grey as I'm comparing it to the box art. I'm really happy with this color though so it's what it's going to be. I'm going to hit it with a couple gloss coats so I can start masking for the orange..

Looking much better Brian. The pin strip blue would be real tough, as far as I know there is no definitive color mix. Only that it's a very dark blue,nearly black color. You'll be having fun while mixing! @brithebuilder

Decal and a heavy coat of Vallejo satin through the airbrush. The decals were way more satin than gloss so I thought this would help unify the surface before painting the orange. The blue/black stripe, actually black in the decal, is going to be kept from the decal and only the orange will be painted over so that I can wrap the paint around the grill.

1 attached image. Click to enlarge.

Excellent result, @brithebuilder, I’ve been looking at Meng’s colour callouts, they recommend a mix of blue and white, but no ratios given, so I think you’ve got it right.

Those are the perfect colors, Brian @brithebuilder
It turned out beautifully indeed.