I've heard many people complaining about the lack of power of their bs 12. I've also experienced the same thing. So I tried different head heavy racket to compensate the power, but none of them was as fast.
Recently, I decided to put 3 grams of tape on the head of the racket (2.5 g at 10, 12, 2 clock position and 0.5 g on the T-joint). The result was amazing to me. It is much more powerful and still superbly fast.
Just want to share this to the community with the hope that people will not give up on the bs 12. It is sad to see not many people discussing about this great racket nowadays.