I had a similar problem with music sounding "tilted to the left". My house is about 50 years old, and it occurred to me that the floor might not be level. So, I used a jack to lift the left side of the floor in my listening room, and the sound slid back to the center. I had to try several different heights for the jack, but after some experimentation I found that about 1.5 inches was just right. Any further jacking up made the sound move too far to the right. You may need to raise your floor more or less, so be patient... If you don't have the time or interest to try this method, then I have also found that tilting your head to the left (or right) helps to make the sound more balanced.