Thanks again for all of the helpful suggestions and comments. I produced the second version on a desktop machine with a calibrated large gamut monitor set to 110cd/m2. When I tried to darken the file with or without decreasing the contrast the file started to look muddy and the soft proofed file looked unprintable. For this version I have gone back to using my calibrated laptop set to 160cd/m2. So 2 versions, this one or one based on this for digital projection and a slightly lighter brighter version based on the second version with some of the saturation removed that will print dark and moody but not blocked/ muddy. All comments welcome
Ken