My Heirs seemed a bit tight when I got them on 7/5 - there was a bit of pain deep in the left canal at first - now they fit like a glove with NO pain - they isolate better than any headphone I have owned. It is like they aren't there, just music entering my head. I would give it some time as the last thing you want is for them to adjust you out of what could be a proper fit.
Nice to know that.
Gladly JHAudio gives us 30 days to send it back for refitting.