When I hit my 40's, I discovered that regardless of whether I was fit or fat, I always had a double chin. I may have just been overly self conscious, but it made me feel old. Losing weight didn't effect it. I've used a lot of gh and the localized fat loss I've experienced have been consistant wherever I shoot it. As to my technique, the only thing I do differently is that I push the slin pin only half way so that I make sure I'm getting into fat. Chin shots almost always result in welts, but they're invisible, painless, and go away in a few days.