I used GW Nuln Oil or Drakenhof Night as a pin wash on my 1/300 stuff, worked out ok, but required a steady hand! One probably gets away with being a wee bit more impressionistic at 1/300 than 1/200.
Those are looking lovely so far, incidentally I'm working on some 1/200 scale stuff myself, to add to my mate's Wings of Glory collection and expand our options. I'd forgotten the BRS stuff was the same scale, 1/200 WWII kits aren't exactly thick on the ground! I'll probably try the GW wash technique on some 1/200 TBDs I have in the queue and see how it goes in the bigger scale too.
I would like to know source of the planes - who made them?

Blood Red Skies wildcats and zeroes.
Blood Red Skies, part of the Warlord range.