I have found that bass boominess can be reduced by either moving the speakers further out from the front wall, as well as moving your ears further out from the back wall.
Of course, moving the speakers further out from the front wall also has the added benefit of increasing depth.
Small rooms will generally have more reflection problems, by the mere fact that you can't get your speakers far away from either the front wall or the side walls. Try to get the speakers at least 1.5ft away from any wall.
I have also found that placing echo busters (or acoustic foam for a cheaper solution) at the first reflective points on the side walls to help improve imaging. Also, make sure the floor is either fully carpeted, or at least has a fairly large rug.
With your room dimensions, this is what I would do. It's almost square so it doesn't really matter whether you place the speakers on the shorter or the longer wall. I would place each speaker 2.5 ft from the side wall (measured to center of speaker). That should then make the speakers about 7 ft from each other (again measured to center of speaker). Now move the speakers out about 3 ft from front wall (measured to front of speaker). You should sit about 8 to 9 ft from each speaker, which should leave about a foot between you and the rear wall. This is not as far as I would like from the rear wall, but you can help by placing some absorbent or diffractive material on the wall(if necessary). Play around with toe-in until you get the best balance between imaging and width (can't help you on this one as each speaker is different). But it's worth noting that in a small room, more toe-in does help by reducing the reflections.
By the way, I own Nautilus 805 speakers and very happy with them. I've found that front firing ports are better if you can't get the speakers far away from the front wall. Let us know how you go with these suggestions.
