As for me, I think I got better results already. It's been a while when I really painted something with airbrush. And I guess new supplies need a little practice always. One thing I can say, Tamiya paints flow very nicely, and they're very good to paint.
This time I cleaned the model with white spirit before painting, and painted a bit thicker layer, since it's so thin.
Yeah, (Tamiya) painting guide by an expert modeler would be nice.