I apologize for getting off topic ... curioius if you are using MeasureTool? I can't get my system to reliably read Bill's charts, just wondering if I'm alone in this.
Yes I am using the Measure Tool. I have a Rev B standard Eye One Pro.
I don't have access to either the UV Cut Eye One or an I1 IO.
The PhotoRag Pearl 5202 chart measured very easily unlike Epson Water Resistant canvas which has been very problematic. I also learnt the hard way not to use the Mac version of PhotoShop CS4 for printing the charts.
So far I have created a LOGO Chroma profile using i! Match. Viewing with the Apple ColorSync Utility, this profile has a close appearance to the Epson 7900 canned profiles for papers like Premium Glossy. (On the other hand I have previously found that LOGO Colorful profiles have quite a different appearance to the canned Epson 7900 profiles.) As I don't currently have a copy of ColorThink, I don't know how the volumes compare but assuming I am interpreting the ColorSync Utility correctly, the HPRP profile does seem to extend further down into the shadows.
I will print an A4 test print tomorrow and compare with various other 7900 prints I have been making with the same image.
I hope this is useful?
Update1: I have downloaded the Epson profile for Exhibition Fibre Paper and compared it with my custom profile for HPRP. Again, I don't know the precise gamut volumes but the HPRP seems to be pushing further into the shadows and appears to my eyes to have a larger gamut size overall. As I have a few blank sample sheets of Hahnemuehle PhotoRag Baryta and Ilford Gold Fibre Silk I may also print some 918 test charts and create some further profiles for comparison over the next few days.