One quick question though. I've been playing with the fit of my tf10's and can now get a fairly good comfortable fitting. However the isolation is nowhere near what I've read about from customs. The seal also breaks fairly easily if I open my mouth. Does this indicate that the fit is good but the canals need thickening up a bit?
Could be. It really depends on your ears and varies from person to person. I always break seal when I yawn or open wide. Seal returns when I close my jaw. That's just the nature of my face I guess. Other people have no such issues.
I'd say give it more time and see what happens - when I first tried the revised BA4 (pictured last page) the fit was way off on the left ear. Couldn't get a seal. After trying for a while, it was decent but not great. A few days later it is getting better each time I use it. Why? I don't know, maybe it's picking up a thin layer of wax coating each time I use it (ewwwww....). This is not the first time I've had that happen either.