Does any one know any good b slots for my brave bow takumi

Breaker skills might work. He's typically better at eating hits against DEF so bowbreaker might be good to help mitigate the speed hit the brave bow gives. Otherwise a tome breaker against any tome user that survives and doubles him to death too often for you. Cancel affinity could be good to counter raven tome users. A sweep skill might help him for poke and retreat or softening up for someone else.