Digital BW, The Print

I use two wide format printers, an HP z3100ps and an Canon Progaf 8300, for fine art reproduction.  I have been happy with the monochrome prints from the z3100 in the past.  Now I have a customer who brings in 35 mm film along with the commercial scans done with development.  He really loves the truly deep, cold, blacks they made for him as large proofs on glossy paper.  I personally think there is quite a loss of detail in the deepest tones.  I believe the look I want for him (20in or 30 in large prints) is as much as possible like my old Selenium toned Silver gelatin prints.  

Have on hand and profiled Epson Prem semi matte and Silver rag among other my media.  Any suggestions for media, printer choice etc. would be appreciated.  J Vee