Stephen,
Very impressed by the 3/4 Spitfire both as an image, and as a plane in its own right. I seen some superb RC models but never anything like this with a pilot at the controls.
On the 3/4 Spitfire you say you altered all six control points to the same value. Tip - initially set the area covered by the first control point quite large. It makes adjustments easier as the effect can be seen over a larger area. When happy reduce its size to what you require, this control point can now be duplicated and moved to position as many times as you require, saving individual adjustment of each one. They can be individually tweaked later if required.
In cases of adjustment to a grey sky, where the fuselarge becomes affected. Set a control point on each of the affected tones. With no adjustment they will return that area to its origional colour as in my example above. You may find you use 5 or 6 points to adjust the sky and a dozen or more straight control point drops on fuselarge to correct the colour there. These should not affect the control points that you have placed in the sky.
Have a play.
Don
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