I am in the same boat. I am always making adjustments, and it is impossible to determine what individual change has made the most significant difference when multiple changes are made simultaneously. I should be more regimented in my methods but the end goal is always better sound and not determining which change has the most effect. I enjoy playing with the sound ALMOST as much as listening to the music.
I used to tweak a ton in my main room. Since I re-configured it, I no longer have a propensity to tweak. I also have a secondary listening area that Serenity_Now helped me with. I found I didn't have to tweak that environment at all.
Incessant tweaking could indicate a deep satisfaction with your environment.