That's a good idea Cory. Add a touch of the grey, to give the 'Slate' appearance. I hadn't realised it was Dark Slate Grey, which, itself, was a variant from Extra Dark Sea Grey. I thought it strange when I was reseraching the colours for my Avenger, as years ago I'd done a FAA Corsair in the Slate/Sea Grey scheme, which I remembered was a green with a hint of grey, making both the colours blend into almost one shade at certain angles.
Fortunately, my Avenger is in the 'equivalent colours', so I could use real Extra Dark Sea Grey mixed with (Light) Olive Drab.