To update everyone:
I started over, printed both High Quality (225 patches) and Extended Grays charts on Moab Kayenta, double checking all settings, from within the PFP application. Made profiles of just HQ alone, and HQ plus EG (supposed to allow for smoother gray tonalities--my primary reason for buying PFP!) Both, when "soft proofed" on the app's test image within PFP at the end of the profile-making process, looked fine. Soft proofing with the profiles from within PS also looked good. However, the EG chart has AGAIN a marked gray/green cast as printed.
I then made 3 prints of each of two images, a monochrome and a B&W, on Kayenta, each via ImagePrint (my "reference standard") and via Photoshop using both the HQ and the HQ+EG profiles. In both cases the IP prints were perfect; but using my profiles, the images had a gray/green color shift, just as always; it was about the same between both profiles, maybe a slight bit worse with the HQ+EG profiles.
I'm at my wits' end here. I even updated the Epson driver to the latest for my printer to be sure this wasn't the problem. There are few choices available within PFP when it comes to printing; the only thing you have to set are printer driver settings, and I made damn sure to disable color management. As someone said, it ain't THAT hard to disable.
What a frustrating waste of time and paper.
About all that remains to be checked is the spectro itself, but that seems less likely--you can just look at the printed chart--at least the Extended Grays--and see it's profoundly green/gray shifted. This is just inexplicable to me.