I've noticed the same thing, maybe it's because your voice changes? You are confident in your speech and don't expect to stutter so you dont. Yes, I had a job interview and had a cold at the same time. I was so fluid, no changing words out, blocking all that other stuff we do. The mind is a powerful thing. I also noticed that when i'm on a conference call and wearing my headset there is a slight delay so when I speak, I get hear myself a second after I talk. I NEVER stutter while on the phone wearing that thing! I'm a mild stutter like yourself and have more good days than bad, but I notice the difference your talking about.