You could always Wash, concentrating on the Recesses, and then just paint Codex Grey over it on the Flat Panels. Finally, drybrush Space Wolves Grey, and you should have a similar result. The Wash should be done over White, I think. So, to recap, you'll;
Prime in White
Wash in Asurmen Blue, ensuring you hit the Recesses. Don't worry about Flat Surfaces.
Coat in Codex Grey, missing the Recesses completely if you can.
Dry Brush in Space Wolves Grey, picking out the Hard Edges, as well as the Flat Surfaces.
That should work.