It sounds to me that the new DAC increased the rhyme and pace... adding to the musicality of the system and letting you relax from concentrating on the details.
To me, while there are lots of imporant parameters in a system, ultimately the most important is rhythm and pace. It is probably the hardest to directly sense and most important as to the musical enjoyment. I have observed that the more rhythm and pace a system has the more I listen (and enjoy) the music versus concentrating on the system.
Your key observation is perceived enjoyment (a very good one, by the way).