What about finding a different way to go about it, you have tried the interceptors without it working maybe it time to look into treats and positive reinforcement.
There is a training group with members in New York State and well as New York City.
Truly Dog Friendly » Truly Dog-Friendly Trainers
Have a look give one a call and see it you can get some hands on help or at least a voice with years of knowledge to guide you.
JL