Im with ya here steve.
I had a "significant" improvement after around 200-300hrs of break in with my 9s.
It was enough so that my wife even noticed it, and for what its worth, shes far from an audiophile, or someone who even cares, but one day, out of the blue, she commented that she thought I had done something else like buying a new amp or "something", she even went as far as to go look and make sure all my gear was the same.
I laughed, and new right then and there, I was not imagining the improvement that, coincidently, and eerily, matched exactly the sound I was looking for!
I kid just slightly there, but the bass did in fact tighten, and the soundstage opened up considerably, which is what my wife noticed immediately.
No science can EVER prove my wife wrong!