I assume you too have abnormaly loud and noticable crackling. Mine started after a flight almost 10 years ago. My ear drum ruptured during this flight. I had it checked out and it healed perfectly. I've had the crackling ever since, but I'm also used to it.
It goes away sometimes in warm or humid environments. Definitely more noticable when it's cold. Driking hot beverages seem to make it go away temporarily. Most of the time I don't think about it, but it bothered me a lot in the beginning. I think it's ETD related in my case though.