After two years of diligent practice I still play with a flat chin, what's wrong?

Jeff also describes this. Some people just have another muscle structure and will always have a flat chin.. Just like other BE elements: air pockets, TOL, the bunched chin is not absolutely necessary. The point is: how is your progression in those two years? If nothing happened, something must be wrong. Doing BE gives different results for different people, but I think everybody benefits from it. BTW. I do BE for three years and I still look pretty flat chinned, too.