I will keep practicing, because I can barely hear anyone even with the music off (because they are a nice fit).
I seem to have a slightly different seal on each ear, on my right if you pull your ear out, the seal doesn't seem to break (but with the left, it kind of moves a bit in the ear). only when trying to pull them out and breaking the seal do I feel that, but I'm not sure if they do seal on one ear totally; but the key thing is, that they don't feel any different/sound any different when they are in So maybe I'm just being paranoid about the left ear not fitting so well. I read quite a few reports on here about one ear not fitting so well, I got it on my mind

Have you noticed any difference in the way the ear feels? Maybe it's something to do with the differen't shape of the canal (but then you would expect the customs to make it the same).