@dentdog I too am familiar with the impact of the Break In Process on both Phonostages and Cartridges.
I find a 100 Hours is where the magic happens, and for a period following this, there is a final structuring to the sonic being produced.
No matter what is said by those that don't endorse the notion, there is a optimisation for the properties of certain components/materials used for an interface, resulting with a Sweet Spot that reveals itself.