Got similar sized ears as you.
Tested the Momentum, DT 770 and HP50 myself.
Momentum were out right away due to the awkward fit. I'm not sure if they are supposed to be on or over ear. Loved the sound and design, but just can't wear them.
HP50 fits much better than the Momentum and I think I could have lived with them being slightly too small to properly cover my ears, but my right ear touches the "driver". The pads are soft enough not to make the "pinching" on the parts of my ear "sticking out" painful. I went through several listening sessions and even after an hour of listening they didn't feel uncomfortable. The headband is another issue, but got nothing to do with the ears.
Ended up with the P7 myself. In terms of fit with "big" ears they are by far the best in my opinion. Do prefer the sound of the HP50 though.
Wondered about the ear fit myself....I mean, would tissue stuffing to raise the pads affect the sound signature that much ?
I wonder if any NAD designers even follow the issues with the headband and earpads users are having...HifiMAN certainly keep their eye on this forum to improve their cans, that much is sure.
Edited by Lohb - 3/14/14 at 2:13am