I work with a Agfa D-lab 1. I'm not sure what your experience is on this field but with colourpaper you can't get a neutral b&w. It can come close, yes but not 100% b&w like with b&w paper. We worked hard in getting it as close as possible, like for example swopping paper to Kodak which is more white / neutral than the Agfa we used before. Now, when talking Epson 9800, a different story.
I've printed primarily with fuji equipment for the past five years, both frontiers and SFA's. Though there was a short span when I worked for a store with a d. Lab. Are you able to run a calibration print at any given time? With our frontier, especially on matte paper, it is absolutely critical to run one immediatly before printing anything you want to be black and white.