Do a test with 50/50. If it is a bit too stark, then try thinning 60 thinners to 40 paint.
I have to do a similar scheme in 1/48th scale, and tried 50/50 using enamels, which was fine. Spraying pressure was around 15 psi.
When I do such things I don't change anything in my paint thinning or airbrush pressure. I just spray exactly as I would anything else. Obviously you need to get in close to achieve thin lines.