Problems with room acoustics??

I have a pair of Acoustic Zen's Adagios speakers, Creek 5350SE Classic integrated amp, and a Rega Apollo CD player. I have a room that is 12 ft wide and 14ft long. The Adagios are 50 inches high and are placed on the short axis wall which is not straight but juts out approx 12 inches on the left side. There is a wall of windows on the right side. I sit approx 7 ft away facing the speakers which are 6 ft apart( tweeter to tweeter) My problem seems to be a larger than life soundstage with some lack of focus or pinpoint imaging. There seems to be too much upper mid-range or resonance. The Adagios are a significant jump in performance from the Silverline Preludes I previously owned.... The room is moderately furnished with two overstuffed furniture pieces and a small area rug. There is also some slap echo in the room....Therefore, I need input on some inexpensive commericial brand sound reinforcement treatment to improve the focus and make the room more damped(not deadened). In addition, should acoustic panels hang behind the speakers or behind my sitting position?? I play mostly classic rock but also some big band music, and fusion jazz. I have considered moving the system to the other side where I sit; the wall is continous and allows for a bit more placement flexibility. (BTW, long axis placement is not an option) Not a an easy chore--the speakers are 80 pounds each....Nevertheless, I love these speakers, I hope they are not too big for the room space. All suggestions recommended. Jim