Tim,
You do have a lot of corners to deal with in that space. Depending on your budget, the current Response line or the new Adapt line or a mixture of both will help tremendously in that room, and that reverb you seek will appear out from under the distortion as we reduce it. You'll also get great gains in terms of soundstage, tonality, and an easy, effortless sound.
Email me to discuss more details, and take a few pictures of the other sides of the room, we'll need to see the whole picture to make the best recommendations.
Best Regards,
Nathan Loyer
Eighth Nerve