I can only give you options not solutions:
Try positioning the surrounds toward the listening position and up toward the ceiling. Play with the specific angle of ceiling-to-speaker as you listen from your sofa.
If the sound is too localizable to the ceiling, and it may be, then simply aim the surrounds toward each other. The surrounds, as positioned, are asymmetrical since one surround has a wall behind it and the other doesn't. So that position may not work either.
The real problem here are 1) that you have your couch up against a wall and close to a corner. There is a very high probability that your bass will be overly boosted and "swamp" the effects of the surrounds. If you can move your sofa out a minimum of 18" (but preferably more) you'll have a heck of a lot more luck in a) decreasing the overwhelming bass bump which will allow b) you to even hear the monopole surrounds enough to worry about their surround effect. 2) The ratio of distances of the fronts vs. surrounds will make balancing the front vs. surround effect very difficult and probably even require changing the front-to-rear balance on a DVD-by-DVD basis. Good luck.