I too have tried this method and the truth is that you should not have to constantly be thinking about how to slur your words together when you talk. This speech sounds unnatural. I had to ween myself off of that. My advice and I really do mean it is to try to speak naturally and avoid gimmicks. If you want more detail then please message me. I would be glad to help you. I stuttered until I was 25 years old. I'm 33 now and have been fluent for 8 years.