Not having a 3800, I have not paid a lot of attention to this thread, but a few comments might be in order now.
With respect to print quality comparisons between Eboni-6 and the Piezo systems, they go both ways. The quality of the profile is certainly one very important variable. Not being in the business of selling inks or profiles, I tend to simply publish what I use. This puts more onus on the Eb6 user to re-linearize or update, particularly during the last year when Eboni was in transition after the death of the IS founder. STS Inks appears to have stabilized the product now, but those older Eb6 profiles need to be relinearized by users. I have done a few, and they are marked with "STS" currently. (I should get around to re-labeling them, but again, I'm not in that business.)
I do favor the single very high density black ink at the 100% point. The reason is for depth of dmax and relative lack of bleed. There can be a big difference there. The latest tweak of the generic dilution base, in fact, was totally about minimizing bleed to enhance sharpness, particularly on watercolor paper.
While MIS has capitalized most on what I publish, what I publish is for the entire community. Former darkroom workers as well as large institutional printers are the most likely to use many of my approaches and results of my testing. At this point in my journey, I'm really most interested in the ultimate B&;W print, though making it reasonably affordable to all is still an important criteria for me. How to balance that criteria with my other interest in having competitive commercial dedicated B&W vendors has been a challenge. Publishing the formulas for the generic dilutions bases hit MIS rather hard, but I felt it was too important to the field to hold back. The ironic twist is that they decided to make money off it by mixing and selling them.
Looking forward and along these lines, one item that is in my fade tester now that might be of particular interest to the B&W purists is a comparison of the 100% carbon Eb6 test strip to one make by an inkset composed of 6 densities of Epson K3 MK. That MK pigment is so tough that at 220 Mlux-hours of light exposure in Mark's http://www.aardenburg-imaging.com/ testing the 100% MK density actually increased! And it's not just one isolated test; it's a pattern. Imagine NO fade after 100 years of display.
FWIW
Paul