Didn't read all but in my therapy we took a winecork and put it between the teeth to speak. Well the stuttering disappeared by doing this sure. But every Change in speech does the same. But only for a while. All those tricks we gathered over the years we started them because they help... And then they stop helping but we made it already a habit. Looking away with your eyes when there's a block? Yea there was a time we didn't stutter when we did that. Now it doesn't help anymore. But we still do it. The stutter itself is often not very strong. It's those habits we build up over the years that make up most of it.