If you are measuring from your speakers to the wall you are most likely off by much more than you think. Rooms are not square. In fact they are far from it.
Try measuring from your listening position to each speaker with string. It is the only way to ensure the speaker are equal distance from you. Once you do this you will notice how the sound stage tightens up with better balance left to right.
Try measuring from your listening position to each speaker with string. It is the only way to ensure the speaker are equal distance from you. Once you do this you will notice how the sound stage tightens up with better balance left to right.