I think all the physical stuff is "extra" things we layer on. Physical things like tension, movements, filler words, etc are all poorer ways of reacting to this disconnect that I feel. I think all of that extra stuff is what makes speaking so bad. A few years ago I started to peel off all these layers of things I was doing to get to the pure "stuttering" underneath. The consequence was that it became a lot easier to speak. Pure easy stuttering isn't so bad