Hi Robbin,
I, too, am exploring how to heighten the feelings in my nipples by trying different techniques. Wuerstchen is the nipple orgasm guru here, and has helped me develop more nipple sensitivity (advice only; my wife does the hands-on part

). My ultimate goal is to experience the nipple orgasms that he so easily accomplishes. Unfortunately, for me, I can tell it's going to take some time to get there.
I wish you well on your progress.
Clara

(trying to imagine what a nipple orgasm feels like)