I'm not saying I don't "do" the double T, I just don't look for any level of perfection with it. Seen too many people sit and become frustrated doing it because the dog isn't perfect then start getting on with the collar and begin the slow breakdown of what was once a nice puppy. Could have quit after a few days of super successful single T and just get on with running some "show me" blinds and work towards getting a cold blind done.