That's looking the dog's whatsits!
Just a thought, but maybe give the red areas a coat of semi-matt clear, just to add a slight sheen. Nearly all period photos suggest the paint used here (and in other units) wasn't full matt.
As for decal solutions, I've tried most, and stick with the original - Micro Sol and Micro Set, although I think there is little difference between the two, so I generally only use the 'Sol'. Works well for me, and has done for the past 30+ years.