First of all I would never use the Z3100 or the Canon with those retarded "color wheel" abw type of set ups. No they aren't linear and never will be that way.
With my Z I made a really good profile that is super linear and I print out of RGB but tone with a Hue Saturation adjustment layer set at 40 Hue and 2 Saturation. I"ve been doing this for about 6 years. It is a perfect lab neutral with no metameristic failure and killer dmax. It works equally well on matte or gloss fiber media. They are beautiful, not as dimensional as Piezography K7 on matt media, for sure, never will be, but very nice in their own way.
The IPF8300 with True Black and White is even easier, and WAY more linear and precise than that crazy Canon half ass solution for monochrome. The difference between day and night really. All you need is to plug in your Eye One and linearize any of the stock curves they have available for similar papers. I tried using those curves on similar papers and they were ok , but no where as precise as making my own custom curves, but you need a good spectro for sure. It is very easy though, and very fast.
If you look at the color inks being used with this approach, for neutral set up you are using no color ink at all. You can't do this with Epson, and even with my Hp Z if I don't use some color ink it's going too cool. But the HP color inks are so amazing permanent and you need so little of it that it never bothered me to use it that way. They don't look different from daylight to warm tungsten spots.
BowHaus needs some serious rethinking of their website. That is the absolute worst documentation and lack of a step by step tutorial that I could ever imagine anyone coming up with. And that is from someone who totally loves their product and uses the hell out of it. It's like they don't care, and maybe they don't. I think their main concern is using it for themselves and if anyone else would like to take advantage of it cool, if not , that's cool too. They certainly aren't making much cash out of it. They are very tiny company, really a mom and pop outfit that makes beautiful prints in La. Their prints on gloss media have always been spectacular. I'll tell you one thing, it certainly makes my life easier and I'm never disappointed with their neutral output on the Harmon Baryta or similar papers. One thing everyone loves is my making the neutral Canon prints out of that TBW on the warmtone Harmon. It is giving you a slight split to a warmer highlight. And that little change makes the whole thing so much more dimensional. Its kind of an illusion of a greater feeling of depth than you really have. However, I do spray them with the Hahnemuhle spray to make them as smooth as a silver print.