i have the 4800 and had the same experience with hahne FAP....calibrated monitor, canned profiles, print looks good on screen, print....too dark....not bad but just....a little too dark....had some custom profiles made...got the profiles, a little better, but still too dark...called them, had them re-do my profiles, still the same.....gave up on the issue, just adjusted for the output in PS.....
second part of my story: i have a eizo ce240w monitor, which i love....when i got it (along with my intel mac) i found out that i could not perform the hardware calibration becuase the software wasn't ready....still the calibration looked good, had no problems other then the FAP issue which i thought was the paper profile......last week someone in this forum pointed out that there was a new software available to perform the hardware calibration on my eizo....did it, looks great, i honestly don't see the difference to the other profile (not hardware calib.)...anyway printed on FAP (hadn't in a while) and forgot to make adjustments....the prints are perfect.....much better then before with the adjustments....
i think the paper is actually capable of showing nuances in the shadows that the screen could not show properly and simply made lighter? not sure i can explain but i guess the DR is so god that the monitor really has to be abslutely perfect in order to represent the range....
a lot of my work depends on the shadows and i always have problems interpreting the screen, because someting backlit can obviously never really represent a flat piece of paper...but the combination of the eizo (with the hardware calibration!) and the FAP is the closest yet for me.....