Your phone's should settle in after about 20 hours and give you the majority of their tone but continue to break in for up to 100 hours after that. By the way nice phones, as far as the Bryston goes, I don't know how it would fair here, it is solid state and you would think that would get you to your goal. I too have set up a headphone system in the last 3 years for some of the same reasons you stated and settled in with tube headphone amps. Just took delivery of a Dennis Had Inspire headphone amp that is incredible, especially when you roll the tubes to your flavor, it really responds. This is one of those end game pieces of gear that you just smile when you turn it on. Enjoy the music