You might try converting and editing in a much tamer color space that fits closer to printer gamut while providing the stability and neutrality of a matrix profile. http://photogamut.org/E_ICC_profile.html
It's the best of both LUT based (scanner/printers) and matrix based (sRGB/AdobeRGB working space) profiles for editing such saturated colors. This profile space tends to allow alternative/desirable choices of hue/saturation and smoother transitioning of color over Soft Proofing using the printer profile which can be unstable and limited.
Well, I read the material on the PhotoGamut website again, and downloaded the ICC profile. I'm not clear on how to use it. I'll outline what I think the workflow would be. Please correct me where I go wrong.
1) I set up the Photoshop default working space using PhotoGamut rather than ProphotoRGB.
2) I convert my raw files to the PhotoGamut working space.
3) I do my editing and gradient color selections the same as before, but in the Photogamut space.
4) I softproof as usual using my paper/ink profile as generated with my Z3100's spectro.
I have a feeling that at least (4) is incorrect, and maybe some of the others.
Also, what do I do with images I've already made, such as the one attached at the beginning of this thread? Do I convert them to the PhotoGamut working space?
Is there an upside or downside to using the PhotoGamut space rather than ProphotoRGB for those images where there are no apparent out-of-gamut problems?
Thanks again for the link. This really looks interesting, and I have forwarded it to a friend who is interested in improving the color management setup we have been using.