Im using 4mb too... the prob is not the dl speed but the upload speed.
4mb streamyx only give a shitty 420kbps upload speed.
so you could only stream in 300-350 bitrate.

so far I dont have much problem streaming drawing in twitchtv creative section.
for games is not so good...
this is how it looks like if when im streaming PS1 game
http://www.twitch.tv/supparider/v/6396709

I used to stream in picartotv, but now I'm starting to steam in twitchtv
here is my channel:
http://www.twitch.tv/supparider

also found another malaysian streamer in creative section, http://www.twitch.tv/twitchbornica this person has like 300-400 viewers every time he streams...

this is my stream quality with 4mb streamyx plan, no unifi coverage.
http://www.twitch.tv/supparider/v/17048189

and this is the reply i get when i ask tmnet to atleast give me 800kbps upstream T_T
https://twitter.com/TMConnects/status/645840305351196673

‪#‎tmnet‬ is fcking with me! in my own ‪#‎twitchtv‬ stream! they put ‪#‎Unifi‬ ad to someone thats been denied Unifi for years! ‪#‎forthemakersoftomorrow‬ my butt!!