I agree that we accommodate to the nuances of our components over time. At the same time it could be possible your system/turntable has found its groove so to speak. Probably a little of both.
I've recently made a few changes and to be honest have experienced some recent synergistic improvement. I don't care for the idea of burn in, seems like a huge inconvenience, especially considering the tube life is paying the price. But things seem to be settling in. We obsess in this hobby. We are so fortunate. Must say the incremental improvement is a pleasure in itself. Glad to hear your experience is bringing some satisfaction.