Something that helped me was raising my concern to a manager, and then I got pulled for some poor times so I explained again my concern to two other managers and they were understand. I'd have thought they'd have noticed the stutter and been more aware of it. Most of them were aware but just didn't put two and two together. Anyway, the point was it reassured me that they were ok with my stutter and the quality of my calls and even my concern of larger blocks and stutters which are rare but when my stutter flares up, it can be quite difficult to say much of anything. Take your time, don't rush it and if need be, speak to a manager.