Mass production of high-resolution digital prints–help needed

Say that someone wanted to publish about tens of thousands of copies of some photographs (about 10 by 16 inches, near A3 size) that are nearly as good as 6-color Epson ink-jet digital prints. Can an expert help this person?

I’m having problems with standard 4-color printing of the beautiful Epson inkjet prints of my sculptures for Beautiful Evidence and am looking expert high-end advice on alternative methods, color correction, and so on. Our Epson prints are beautiful, the 4-color proofs we’ve seen are not. What to do?