I've been streaming to Twitch Amsterdam NL @ 3500bitrates as well as lower numbers like you've mentioned (3400-3200-3000) and I have never been dropped yet.
I'm really curious as to how this thread will evolve, especially the main question. "Max bitrate for non-partnered?" Does anyone know this value? or roughly? I read someone was streaming at 4000bits?
Anyways keep us posted, I'm interested.
Also, a question for you ball2hi, what fps are you streaming at? I noticed you have my bro's CPU, a bit lower rig then my own, and I was simply wondering what you are pulling off like "quality"? 720p30fps@3500?