MartyMcfly3004
100+ Head-Fier
I have similar pads - the 'Dekoni Audio Fenestrated Elite Sheepskin Replacement Ear Pads for Beyerdynamic DT and AKG K Series Headphones - Code EPZ-DT78990' - these are basically perforated versions of the ones you have and are supposed to provide more comfort. However, interestingly, they ruin the sound from my T5p Gen2 in terms of the lower end essentially disappears!
The Choice Leather Dekonis work best for me on the T5p Gen 2 and I imagine your Sheepskin ones provide a very similar seal and level of comfort.
It was a brave decision on your part to cut out the driver cover from your pads! I've been debating doing this on my Choice Leathers for a while now but haven't come to a decision yet.
Yeah I tried some velour pads on them and they sounded garbage. Pretty much for the same reasons. Closed back need to isolate or you lose all the bass.
Cutting out the cover was easy. Not recommending it in case it ruins the sound for anyone else but I haven't regretted it. Will do it again when I eventually have to replace them.