I'm still getting to know my pro-1000, which I use from the Print Studio Pro-2 (PSP2) plug-in for LR. Last night I was rather mystified why I generated a B&W print in which the dark tones were so squeashed down to black, so I started looking around.
First thing is that the soft-proof available in PSP2 was also much darker than the image in LR itself... I should have paid attention, but with PSP-1 (with the pro-100) there was no important difference.
Anyway, if you go into the "modify" tab in the righthand pane of PSP2, you find a "tone" option, with choices soft, standard, medium hard, hard, and very hard (actually on mine: doux, standard, mi-dur, dur et très dur, but I'm guessing the translations). Surprisingly, it seems that "hard" is the default! Clicking through the options on an image with a lot of dark tones the difference is obvious, and for me "soft" was closest to what I saw on screen either in LR or after exporting as jpg.
I haven't yet check if this option is also present in colour...