No problem...
I just wanted to compare for you..I also read your post over on the 4.Ai thread
I am certain
my fit is correct..and..
-If I push the CIEM in, there is a bit more "blockage of noise" as you describe, but no increase in bass response.
-if I rub my fingers together I can NOT hear it but I CAN hear fingers snapping (with no music playing)
-I can hear a "crackling" as you described while moving opening and closing my jaw fully but that is I believe my beat up jaw joints crackling....also with extreme jaw movement I get a bit of "crackling" around the CIEM which I think is the CIEM just shifting a bit and "almost" breaking seal. I only get this in my left ear because my jaw is looser or something and there is a lot more movement in my left canal. But for mostly all purposes this is not an issue.
Try those "bass heavy" and "bass light" tracks I sent you to test, I have a feeling that you have a seal, from what it sounds. You may be used to the cans and massive bass. The 4.A is much much more neutral in that regard.
Now the 8.A on the other hand....