Beautiful setup and speakers. Congrats on the fantastic deal.
In my experience the bass is less boomy when I move the speakers away from the corner. I move my speakers (on sliders) to the middle of the room for proper listening sessions. Imaging and bass get much improved.
Your speaker cable looks a bit thin? I got some non-brand generic gauge #10 cable so that at least will not be a bottleneck. These are low-impedance, low sensitivity speakers, so you will be pumping a lot of power and current at higher listening volumes.
Did you check the link I posted above? In addition to the specs and review article I linked to above, this 4 page brochure has good info on the physics behind the design:
http://www.audiokarma.org/forums/showthread.php?p=8516799#post8516799