Dude, My Avenger went through a real trial in the finishing process. It came out better the second time.
the problems you are describing are patent issues with a single action gun. to do drop shadows, ddetails and special effects you really need a dual action. Envision that surge of air you get? you depress the trigger and the excess air goes pffftt,, and its gone. THEN you start to slide the trigger back while holding it down, as you gradually ease it back ( yes it will take practice and developing a feel) you gradually begin to get fluid in a quantity you can control! seldom will you ever have full air, and full paint at the same time. The key is that you can CONTROL it, its just like flying a ringmaster versus a full blown Impact or SV-11 , You CAN make the Ringmaster fly the pattern, but the Impact will be easier to fly accuratly.
If you want my opinion, as much as you would like to implement this effect you have in mind, you may be better served to get a dual action airbrush, the VL is like 60 bucks I think if you shop around, and use it to apply some exhaust streaks ( lightly, dont get carried away) . Do some insignia, stars and bars,, maybe some shaded panel lines ( they are a blast to do, research how skins are put on airplanes for a reference) gun muzzle smudges,, and get some experience with the airbrush first before experimenting ON and airframe for the first time, just my two cents worth buddy, its a cool looking plane, sometimes letting the subtle shine through is better too,,
anyhow, do as you see fit,
Incidently, that surge of air can also be fixed with a better regulator,, but its some $$ to get a good one