My stuttering followed a similar time line where my stuttering lessened in highschool 14-17, and then worsened when I started college at 18, but I didn’t have the same habits, so I’m thinking others are right it’s related to teen hormones, not those habits. I know it must be frustrating dealing with the higher occurrence of disfluencies, I found a support group at my college and making friends who also stuttered or at least understood it better than the average person helped a lot. Maybe it’s worth looking into it if your town has one (NSA has a lot of charters). Wishing you the best.