Question:
When they were setting up your fitting, did they mention jaw closed, relaxed, partly open, or any certain position for your jaw?
When listening, have you noticed whether the sound changes with swallowing or moving your jaw?
This was discussed a little by Jim Austin back in 2011, but I was interested in their/your approach.
https://www.innerfidelity.com/content/shure-e4-ear-earphones-more-weston...