It's interesintg because I've experienced brief spells of confidence and I also experience brief spells of fluency, they are not the same thing and for me, one doesn't necessarily have something to do with the other. However, I find if i'm less confident or particularly self conscious, my speech does suffer. I think a lot of stuttering comes from state of mind, I'm constantly fearful of stuttering in front of my peers, but less fearful around people at my job (customers) or people I dont really know, however, I find being in one situation does not automatically affect my speech. In the end, for myself, it just comes down to chance. I have good days and bad days and medium days and everything in between. No one factor or one change, is gonna really help or hurt my speech significantly.