Hello Luator,
I disabled auto-enhance option of Saal Digital. I try to make soft proof also with Gimp that has some of the options that are missing in darktable, but on the display the soof proof looks almost the same. I think that i need to find i correct light in order to compare prints because obviously the illumant is very important. For example If I look at prints using daylight ( near a window ) I can say the brightness is almost the same but the colors have less saturation.