My fit is pretty good where I don't have any discomfort and the sound quality is great...however I notice that I get a distracting pop sound in both ears, more on my right ear whenever I move around or look up. I noticed more ambient sound comes in when this happens so I figure the seal is breaking. The sound quality does not really get worse but the pop sound/suction sound is a bit distracting. I am thinking of sending them in for a refit, but am not sure if I am better off requesting longer canal tips or a wider aperture or both. Does looking up (mouth closed) typically cause this to happen for any other CIEM owners out there? Just trying to get an idea of what a good fit would be like. Going down stairs in this thing definitely caused the popping sound to happen a ton. Thanks for your time everyone.