I agree. You can always place acoustic material strategically to deal with wall reflections, and use bass traps (rolled up rugs?) in the corners if that bass is out of whack. If you have the 'I-think-I-am-a-genius' problem (I do), it helps to bring a friend in to look at your layout with a fresh perspective. Tom dropped by my house, looked at the setup, and made some speaker and furniture move suggestions that fixed a lot of problems. Best audio investment (cost me nothing) I have made for that room. It sounds ten times better than before. So keep trying - the magical speaker position and toe-in is somewhere in there (once you find it make sure you get the gps coordinates, in case your wife decides to move stuff to vacuum the floor!).
OBG