I would recommend Charlie Bryant, although I do not believe he is BCA certified.
I have seen him giving lesson to pro players such as Mr. Kuo (2nd in WPC 2005, 3rd in WPC 2004, 3rd in All Japan Championship 2006...) and Landon Shuffet. The value of his teaching is proven. I do not see how you can go wrong with Charlie.
When I met Mr. Kuo in Japan, he told me his break has really improved after taking some lessons from Charlie Bryant.
This is how I look at it: If Charlie can help a World Champion, he can most likely make a difference in your game. I just don't think it can get better than that.
Richard