After a few months from purchasing the CC pads for my Abyss Phi, I am glad to report that I concluded they are, for me, an improvement over the originals.
With the original pads, I found that my sweet spot for sound quality was with the seam like in the picture below and with the frame fully stretched out and bent backwards, so that the pads “open” in front of me.
That particular fit gave the best result for bass response (deep but not boomy), and was also very comfortable since the pads were barely touching my ears / face and I could feel almost no pressure from them.
The drawback of this (almost floating) fit was that every time I put the Abyss on I had to fiddle a bit to (re)find the right position around my ears, and any movement of my head or change of position on my couch could need a re-adjustment of the pad – i.e. more fidgeting. Also, with that fit, all the weight of the headphones rested on the tip of my head via the headband.
With the CC pads, after some trials, my preferred fit is with the seam like below. This matches the tonal balance I was used with the old ones, possibly even further improving on the bass (!).
After some adjustment to the new feeling, there still was a sense of clamping around my ears and jaw I did not like, so I decided to
slightly bend outwards the aluminum frame, like shown in this video:
.
Now the clamping pressure is reduced and I find the CC pads very comfortable (4 straight hours of listening only today). Furthermore, the headphone fit is very stable, it easier to forget you are wearing them compared to the OG pads. Wearing the AB-1266 is now basically plug and play, with no need for fine tuning each time I put the HP on.
As for the sound, I can say the imaging is even more pinpointed and the general sense of focus is increased. The vocalists / soloists seem a bit more forward than before.
Before bending the frame outwards, I felt that I had lost some of the speaker-like presentation of the original pads, so I was still switching between CC / original depending on music type, which is not the case anymore.
In conclusion, I needed to spend some time and effort on them, but I now think the CC pads provide a better overall headphone experience: better fit, comfort, imaging, while keeping the visceral impact, openness and soundstage width of the original pads.
.. Not forgetting the luxurious look and feel of the perforated leather