I have lived for years with a similar situation. The balance seems always weighted toward the left side. I tried everything you can try (speaker placement, component replacement, etc.). I have even had my hearing checked and found no difference, right to left. I have now--after years of torture--simply adjusted the balance control (or the volume controls on my Audible Illusions preamp) to establish the true apparent balance and have learned to live calmly with the situation.
It's living comfortably with the skewed balance control that is the hard part.
It's living comfortably with the skewed balance control that is the hard part.