When I started using soft proofing, I would get the image looking the way I wanted on the monitor, then open a duplicate next to it and turn on soft-proofing on, and apply adjustment levels to the soft-proofed image to get it as close as I could to the original non-soft-proofed one (I found that aside from any gamut issues, the soft-proofed image would look a little darker, flatter and cooler (Epson 3800 with EFP), then print the adjusted image. Then I started wondering why not just keep soft-proofing on all the time, since I only print on one paper? Is there a reason not to? I'm never trying to color match, just to get a print that looks good within the limits of looking natural.