I have the exact same printer. The process with a new paper is two-fold. First you need to calibrate the media, then create a profile after the calibration. The calibration linearizes the printer to ensure even and smooth tonal ramps from dark to light. After calibration, I use APS for profiling, but the process is the same for using the standard profiling system without APS. If you have succeeded in doing something with only one letter size sheet, I would imagine that all you have done is calibrated the printer, which means you would need to use a preexisting profile from Hahnemuhle or another source to go with your paper calibration. I know that APS needs a much larger area for printing patches than a single letter size sheet, and think that the standard profiling process does, too.
Unfortunately, it is very difficult to get anywhere with testing new papers with only two sheets to work with, beyond seeing what the paper surface looks like and what it looks like inked. Getting a representative image with only those two sheets is nearly impossible. Just as a double check, are you certain that you have printed on the good side of the paper? Is the surface of the Pearl and Satin paper slightly sheeny?
As an aside, these are both very nice papers and if you like the surface, should eventually get great prints out of your printer with them. The PR Satin is not a paper for every image. I don't like the posterization effect with high contrast photos, for instance, but for images with more uniform or lighter tonalities, I think the image quality is very unique and pleasing. With HP's black and white inks only, printed with printer managed color, the pure carbon inks on the Satin paper take on a beautiful warm metallic bronze tone that I love.