Bill, you have a LOT of volume to fill with many reflective surfaces. You're pretty close to the rear wall, any way to soften that area behind you? Unless the system is off center, side-wall reflections are probably less of a concern -- side walls are further away and you should be able to toe-in the speakers so direct sound arrives much sooner. I assume hand clapping provides quite a bit of echo.
I would look for monitors with larger woofers (at least 6.5"; 8" better), one or two subwoofers, utilize bass management (i.e., high pass the monitors) and EQ. And try to soften the room.
I would also consider using an AV surround pre/pro with Audyssey room mode correction. This would be better than simply EQing the bass channel. You'd also get precise level matching, phasing and time delays. If going this route, I'd also switch to active speakers.