That's precisely what I did. It might have been nice if a glossy and matte sample were posted for a matte and glossy paper for comparison on that page as some one new to piezography may not know where to find the proofing profiles. However, I know you've got a lot of other things on your plate.
Anyway, I did notice something curious. When I soft proofed the Selenium on JonCone Studio 2 and 7 (glossy and matte respectively), then tried the same thing on the Hahnemuhle FAB and PR (also glossy and matte respectively, if I got it straight this time...), the JCS shift to sepia is far more pronounced than that in the Hahnemuhle. Are there other papers that show a similar strong sepia shift towards?