I’ve not had lasting success from HCRI in terms of not stuttering at all anymore, but I like the tools they gave me. When I practice my gentle onset rigorously for several hours I can be fluent for a couple days. But my stutter is not as severe as yours. I’ll say that as an outside observer you seem to have your mind made up on things and will fight anyone who suggests anything other than your opinion. In my opinion you have to find some room for optimism and self compassion. I think one key step is to reset your self image. I had a maladaptive self image for a long time that caused me additional problems on top of the stutter. I think much of it was rooted in the stuttering and the resulting shame, isolation, and social dysfunction, but it’s important to step outside all that. It’s your life. You tell yourself a story of who you are and what the world is like. Change that and you change a lot.