I learn more on these threads than I contribute but this topic is something I always benefit from so anyway, here's a quote from the thread "prints too dark" which I encourage you to read. It has so much information there, my extrapolation is just one idea of many great ideas given by other posters on how to trouble shoot "PRINTS TOO DARK".http://www.luminous-landscape.com/forum/index.php?topic=82413.msg665769#msg665769
Quote: Anyway, the way I actually set up a calibrated monitor and viewing condition on a practical basis is to use the monitor calibrator to define the monitor's whitepoint, blackpoint, color temp (I use 5000K not 6500K), and TRC, and then I physically move a pair of approximately 5000K Solux lamps in the background to create a print viewing condition that allows the printed image brightness to match the image brightness on the monitor, so I don't think our approaches to a proper print viewing environment are so different after all. Unquote
My other thought: Have you done a colour test? Digital Dog has a colour chart on his website, which is what I used to identify where I had problems. If it works with other profiles and not this latest one, wouldn't that suggest the profile is the problem?
Yes, you are correct I use PS for plug-in to print and not LR. So there's that.