The bass traps will be helpful. The asymmetry of your room is problematic, you are getting more boundary reinforcement from your right speaker vs. the left. Some kind of absorption on the right wall would be nice, except your equipment rack is there. I would consider moving the equipment rack to behind the speakers and treating right wall with some absorption. Still, with the juttting wall right next to the speaker this may not make much difference unless you placed the speaker more out into the room (away from front wall). Have you thought about different positioning of the speakers, something more symmetrical.
Synergistic cable has just come out with some interesting new free standing room treatments, pricey, but they look good to me. Don't know about their capabilities.
Synergistic cable has just come out with some interesting new free standing room treatments, pricey, but they look good to me. Don't know about their capabilities.