If you'd like, you can definitely break your secondary behaviors and just have "clean" stuttering. What worked for me is to watch myself in the mirror when I speak. I talked to my clinician while looking at myself in a mirror. When I stuttered and exhibited a secondary behavior (closing my eyes and tensing my face), I would freeze at that point and voluntarily relax my face muscles. I would sometimes miss these behaviors as well, and my clinician would tell me to freeze sometimes as well. You can practice this with a close friend too. Additionally, I would make several phone calls in the mirror and repeated the mirror work above. It is really, really important to maintain eye contact with yourself during mirror work. It feels awkward af, but you get used to it after a while. It's a long process, but you are able to break any secondary behaviors and "unlearn" them, and just let the stuttering out.