For what it's worth, I have mine in a positioned 78 inches center-to-center and 6 feet from the back wall. My room is 28'X18' with a vaulted ceiling. However, I can not place them symmetrically in the room because of a foyer on one side. They are far into the room and sound the best in this location for the particular acoustic challenges of my room.
Have you eliminated the possibility of something being amiss with your components causing the imbalance? For example; have you swapped the left and right speaker cables to see if the imbalance changes with it? Are both lights on the rear of the speakers glowing yellow when in standby mode and green when playing?
Have you eliminated the possibility of something being amiss with your components causing the imbalance? For example; have you swapped the left and right speaker cables to see if the imbalance changes with it? Are both lights on the rear of the speakers glowing yellow when in standby mode and green when playing?