Yeah its weird because I also initially had the repetition but overtime it eventually evolved into the block type stutter which is what I still have not. I also have sounds I block hard on An sounds, Gar sounds, Mil/Min sounds, and lots more. What I started to do is for these hard block sounds I just replace the hard block with a voluntary repetition seems to help get the word out...kind of like an engine sputtering to life. Like if I have to say "That will be ready in five minutes" I know I will block on the word minute so I just sputter m-m-m-minute instead of freezing awkwardly for like 30 seconds. I still block on certain words when I am not consciously using that voluntary stuttering technique. I guess I am just trying to train myself to accept repetitions as I think my brain has is subconsciously trying to avoid them which leads to the hard blocks.