I'm trying this right now and it's definitely adding more space for my ears to breathe. But the clamping pressure has also increased a bit. But I'll give it a closer listen and compare back and forth between using cotton balls as padding, and without :) Not noticing a big sound difference right away though.
Okay, so after some extensive listening and a bit of comparing back and forth, this 'cotton-mod' does add a slight amount of boominess to the bass, which lessens the SQ a bit. So I guess I can confirm what third_eye said. So in spite of the added comfort the cotton-mod provides, I've removed it and will just live with a little bit of pressure on my left ear. Either way, it's not nearly as bad as all the other headphones I've tested so far :) I just don't like what it does to the sound signature.
And the Shure SRH1540 will probably arrive Thursday, so I'll do some testing over the weekend :)
Edited by starfly - 11/12/13 at 11:35am