I think you've got the Measure 32 camouflage scheme down really well, Doug. Good job and very well-executed. It's going to look great when finished.
What Bish said about apply the base color before adding the second color is true, and I often do this even when airbrushing. I think it works because the second coat of the first color sort of seals the edge of the masking tape, preventing the second color from seeping under the tape. I always do this when I paint yellow tips on aircraft propellers.
Anyway, great work on Missouri! Keep it coming!