How big is your room? Have you played around with set-up? Perhaps you have the speakers to close to the back wall? The sound you get from a speakers is always the reaction and relationship of the room with the speakers. If at all pull those mothers away from the back wall and make sure they are not too close to the sides either. Unfortunately, unless you have a large room ( bigger than 20 x 20 ) I do not see you fixing this situation especially if your set-up is not symmetrical.
What is really confusing is that you say there is a "lack of bloom and definition," and that is sounds like standing waves. Standing waves cause "bloom or boom", not the lack of it and most often is a coloration. Have you anyway to measure the speakers with something like a cheap RS SPL meter and something like Stereophile test CD?
If you have a small room or the inability to have a symmetrical layout with NOTHING in-between the speakers then I say sell the speakers and get something with less low bass extension but with an upper-bass tilt.
Also, make sure you speakers are wired in-phase.
Keith
