I use the stock cable and did not make any mods. I did not yet hear the Composer by Austrian Audio, I heard/have, among many others, Focal Utopia, LCD-5, Meze Empyrean, HifiMan Susvara and Arya, Sony MDR-Z1, Pioneer SE-Master 1, Beyerdynamic T1 (first and second generation), Beyerdynamic DT1990...

After spending 30 years in the Hobby, my personal conclusion is this (and it is very personal of course): My favourite Headphones of all time are the AKG K812, the Grado RS2, The Beyerdynamic DT880 600 Ohm and the Hifiman HE6SE V2. I heard and tested about 200 Headphones in every price bracket...