nonexistent is exactly how it feels like. Anyway I tried every single possible tips I had and nothing gives me a better fit. They all act the same which is weird..I find it very strange burn in will change rhe sound that much to be honest. It basically has to add a bass that is not there in the first place. we'll see...
Like I said, the reality is that without a good seal, even 200 hours of burn in probably won't matter much because you won't get a proper seal.
I should add that at the moment I listen to my 9927s out of a C&C BH which really opens up the soundstage and give me the option for a bass boost, though 90% of the time I don't feel that it's needed.
How are you wearing them? I find that I can only get a proper fit when they go over the ear with the fin turned up, then it's like a glove.