Glad to see you've found a way to help your stutter! I too have had great success with this same scenario however I worked at a grocery store, packing bags and helping people to their cars etc. Customer service was heavily emphasized so i had no choice but to be social. The first month or so I was quiet and just didn't talk to the customers or any of my employers, but as I realized I had to just say the same lines over and over, it became fluent to speak to people, and eventually instead of reading from the same script "How are you today? Did you find everything you needed?" I began to be able to expand on it and make jokes back to customers when they made one to me. Today I'm really successful in my speech however it's not entirely gone but still haunts me.