I accomplished this (brain to speech tempo) through a hand pumping technique that my Dale Carnegie instructor (a former stutterer) showed me. At the end of an 8 week DC class, I was 90% fluent. Within a year, I never stuttered again. That was 40 years ago. I was a gasper from 7-25 years old. If I ever saw that man again, I know I would fall to pieces. He's my personal Jesus.