Sounds like the drywall has to come down and redone. I can live with that, its just screwed up no mud fortunatley. I did 90% of the construction on the house and just about all the walls were built twice (not by mistake, i didnt like the layout). I do have insulation on all walls and ceiling cavity. Ill check the cavity depth for the back boxes once the drywall is down. Ill try and get some pictures tonight as well. Maybe the best thing is to remove the inwall speakers in the living room and add some small satilites.
Ill do a search but is there any place in the New Hampshire area that supplies HAT channel and clips?