Generally speaking you should not have to provide wall-to-wall treatments to "tame" a room; thus the full wall treatment combined w/ full ceiling and carpet have caused a dead room. As Arcmania suggests, you can start by removing the ceiling treatment. I would do this in stages, you may find that leaving bits of treatment at the wall/ceiling junctions and some other strategic spots will help. However I would be prepared to add some reflective pannels if the remodel of the ceiling is insuficient. THese can be placed adjacent to the speakers on the wall, and/or behind the speakers, another spot is behind your listening position.
Good luck,
and happy listening
Good luck,
and happy listening