Use the Future cut with Tamiya Flat, and crank your air pressure up.
When I want it DEAD flat I shoot HIGH pressure (above 60PSI). It comes out DEAD flat but you have to be careful of areas like wingroots that can cause severe turbulence and bounce the stuff back and settle later.
What you want is enough air pressure to get the particles that make the flat paint "flat" to stand up and reflect less light, just as sandpaper grit is attached at angles to the carrier sheet. Being slightly thinned at higher pressure does just this. Dont do this over pastels tho, it just kills theeffect of pastels.
David
Build to please yourself, and don't worry about what others think!
TI 4019 Jolly Roger Squadron, 501st Legion