Clueless asks a very important question. Carpet or hardwood flooring, size, parallel walls, ceiling heights etc. All make a tremendous difference.
Imaging problems may be speaker placement, particularly speakers being too close to the side or rear walls. Check out cardas speaker placement page ... he recommends speakers miles out into the room ... it worked wonders for me.
As for dynamics, I'd also be interested to hear your comments as to how different the system sounds with the power conditioning removed, and with stock power cords on the amps. Anything that filters could conceivably restrict current and restrict the dynamics of a power amp.
Bear in mind that my experience is with much less expensive systems .. but I thought I'd offer my guesses.