I don't have any 'good tips'. My stream is pretty dead often also, but I don't mind it. I stream so I have a record to do highlights and so friends can watch as they wish. I do know Twitch has some auto-sharing options, tie them into your twitter, Facebook and set up some linking between them and YouTube with hash-tagging in your titles and it seems people will share and favorite it on their own whim. It should build up gradually, just keep streaming!