Thanks for that file Doug. I spent an hour monkeying around with it and all types of profiles, old and new, on my computer.
I got to the point of printing Granger Rainbows in CIE RGB, ProPhotoRGB and a few others except for pressing the print button, feeling economic. Instead that started me off reading color science materials and assorted web pages about Argyll. I've decided to skip that step of very good, but still generic print spaces, and pursue as Graeme suggested directly producing TIFF specific profiles using tiffgamut, collink, and cctiff (the latter to embed the profile in the files, then later print in noncolormanaged work flow). That looks like by all accounts what will get me at least very close to an optimal printing workflow.
I'm happy with the generic Argyll icc printer profile generated earlier and that should work well for noncritical images. I still have yet to produce my first print that way, but am working on a set of commands now in a mac textedit file (thanks Alan) today and hope to make my first in a few hours.
After that, I'll probably use the targen program assuming I get the print workflow worked out and regenerate a smoothed out test patch kit.
One interesting twist on all this is I shoot with Hasselblad and do my raw development in Phocus. They have their own proprietary workspace they call Hasselblad RGB and Hasselblad L* which, according to their marketing literature approximate Adobe RGB and ProPhoto RGB. They only approximate those spaces in size, looking at them with ColorThink, and are actually very different. The Hasselblad L* is missing a lot of suspect dark blue colors (I'm suspecting imaginary colors) in ProPhoto RGB and differs a little in greens and some yellows . . . I've decided in the interim to bring that colorspace into Photoshop as my working space and see how that works out. It's probably more geared toward my raw processing too.
Assuming I actually get a print after all this, I guess I'll have to make the donation to Argyll!