Treatment doesn't help a lot in the modal region. The traps have to be too large to be practical. It's movement or EQ. But there's really not a lot wrong with your response.I know room treatments are recommended before EQ
This would depend on the room, as it refers to the modal frequencies for the standing wave resonances set up between parallel surfaces in your room. There are axial modes (two surfaces), tangential modes, and oblique modes. Long story short - these cause the peaks and dips in your subwoofer response.What is the modal region?