Charles,
Other users have noted that the HPSFA output is more pleasing than the straight PR. But from what I gathered from HP these papers are not identical. There is a coating difference, as the HPSFA was optimized specifically for the Vivera inks.
After calibration, have you compared a print using a (non-APS) custom profile of HPSFA to a print using the canned HP profile for HPSFA? This would eliminate the coating difference as a variable. Again, if you're comparing a custom profile for PR with a canned profile for HPSFA, there may be more at play than just the profile.
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I was printing with the HPSFA but I made the mistake of thinking that calibrating and profiling on my printer would create the best profile. I printed quite a few images this way. I only recently printed using HP's in-house created (canned) profile. The only thing I did on the printer was the calibration which if I understand correctly linearizes or characterizes the heads and ink to make better use of whichever profile the sending application (photoshop in my case) applies.
I now certainly understand that the only way to print on FA paper with this printer is to use HPSFA and their profile. It make a HUGE difference to my eyes.
The only thing left to do as far as my workflow goes is to find a very high quality brush, unload the paper from the printer, pull the appropriate length of paper from the roll and drape it across the top of the (freshly Swifter dusted) printer and give it a brush-off , roll the paper back up and feed it back into the printer. I have too many ruined prints from the flaking of the Hahnemuhle paper. I have seen the same thing on PR308. It is somtimes not easily detected depending on the image area it falls on. Other times (too many) it is way too obvious(another expensive bird cage liner). I'm not sure if as I suspect the coating actually flakes off after the print or if flakes coming off the back of the paper lay on the front of the sheets, take the ink then fall away. A very frustrating problem for an otherwise *superb* substrate.
Charlie