I have the same unit and find it indispensable in taming an enormous hump in response around 60 Hz (your "before" plot looks similar in many ways), using 2 ProAc Response ER One subs with Tablette monitors.
It just makes things easier to place in the room, the subs don't have to be located in any exact spot anymore, I am free to move them and then make an adjustment via DSP to make it sound like just about any other position in the room.
Great unit for subwoofer integration, though I admit I've never run mine full-range, are you?