Every few months I become dissatisfied and reposition my speakers. Separation, toe in, distance to walls, etc. And, lo, the heavens open up and I can hear angels singing. After a few months i do it again with similar epiphanic results. Finally, a year goes by, and I’m back to the same position I started from—and the cycle continues.
Where do you live? I live in Ohio and my room and speaker response as well as my ability to hear it are most definitely affected by changes in temperature, humidity and barometric pressure.