How do I adjust Homepod stereo balance? I have a stereo pair of homepod set up in a normal hifi set up, that is I sit between the speakers and the speakers an I are in a triangle.

music Volume is clearly unbalanced - a center sound is louder on the right speaker.
I physically swapped the speakers several times to rule out a hardware issue.
My room is not symmetrical
I have tinnitus in my left ear so sound should adjust for this disablement.

How do I configure things so that central sounds sound from the middle to me?
Other than moving your speakers around about all you can do is play with the balance and the equalizer to adjust the sound to your liking.  There is a free app named eqMac which lets you apply an equalizer to your mac. It also has sensitive settings for the balance. You can adjust the balance to get the appropriate settings for your home pods. Maybe this balance adjuster does a better job than the internal one.