Welcome to the club
@barturtle I noticed this was your first post. It's a real good question.
I know exactly what you are talking about. Occasionally I move my speakers, just a little of course, as I am always looking for audio nirvana.
What I tend to do more is adjust channels within 0-2.5db depending on speaker position.
I sit about 12" off center, as my seating is for two, so the arm rest between the two seats is dead center. Even after a fully calibrated rig, depending on the recording I might change the levels a bit.
My surround rears and center positions are good where they are, level adjusting depending on recording is usually flat at my left side and can be 1-2db higher on my right.
Where I seem to have most of my adjustments is the R/L fronts, still trying to get it dialed. I move them occasionally, toe in/toe out/, etc.
I listen to a lot of stereo and that can be everything under the sun, sometimes purposely vocals are left or right, sometimes phantom center, instruments stronger in one speaker, weaker in the other, this is just how it was mixed, not really a lot you can do.
People on QQ are always talking about raising and lowering speaker levels.
If I change my pre/pro to Pure Direct, which is nice, the channel level feature does not work.
I was taught that a good way to get your sweet spot dialed in is to listen to a Mono source and get that sucker dead center to your listening position.
My advice is that if you are sitting and listening and your enjoyment is being interrupted by your brain saying "this just doesn't sound right" it's a good indication you need to try some small adjustments and the channel level feature if you have that is your best friend.