I received mine about 2 weeks ago (after refitting my left ear) but I'm still noticing problems. Can different shell sizes affect sound quality / sound stage / position inside the head? Can't tell if its because of my damaged hearing (right worse than left) or it's because of the shells/drivers themselves.
The left ear (the one on the right) is approximately 1~2mm larger on the top but that's only for the outer ear part, and also the driver positions are a bit different (because of shell size). Sound-wise, sound stage actually sounds realistic with my left ear, but my right ear sounds artificial (or I can't hear it, but that's because I can't hear high frequencies well in that ear). The sound position also leans more toward the left of my head rather than centered for bass impact, vocals, and everything. It occasionally centers after a period of time or if I insert them differently, and I do not know why. Also fit still isn't perfect in my left ear generally (as when the cord gets tugged, the bass impact becomes more resonant) but I don't really have money to keep refitting (~$42 each time via EMS). They still have impact and they do isolate very well, just the impact gets slightly more intense. My right ear has a perfect fit albeit it feels much smaller in the ear and the sound stage issues.
Source is a crappy Samsung Stratosphere (lot of hiss) but no left/right channel imbalance issues (tested it with other sources, same problem).
Long story short, anyone know if it's just me / my ears or could it be caused by the shells themselves (or maybe even drivers? These are 2 years old but according to HPA, he hasn't used them for a year as he bought this pair to reshell for as a backup. Westone ES3X by the way)?