break in can change the sound sometimes, yes, buhhhhh.. not always, for example if the leaf spring is tilted outwards, it's never going to tilt back inward..
However, if it tilting inward is the problem, then yea, there's a chance that Breaking-In would push it out more.
If it's the Slider that's too thick, there's a chance, but we're well into 10,000+ keystrokes for any chance in slider diameter