If the soft proof looks the same as your print then your monitor profile is wrong, if the monitor is the same as your print then your soft proof set-up must be wrong . They can't both be right.
The problem with soft proofing it relies on 2 profiles conversions, image to printer profile and then to monitor profile. If there any errors in those profiles, then soft proofing is unreliable a waste of time.
There's nothing like checking a real print; Qimage Ultimate has a test strip feature to save on paper & ink.
Terry