You have the general idea. Spraying too close will leave streaks and the heavier paint film in the middle of your spary pattern will allow the metalflake to "lay-down" differently then in thinner areas. Fogging the final coat is the best way to minimize this "mottling" or "blotching" of the metallic finish. This is a problem even with BC/CC systems and can be made worse by the clear coat because it will magnify ANY imperfections or inconsistancies in the Base Coat.
Mark