Well, easiest way to improve your quality would be switching games and cutting the 'your mom' jokes and homophobic slurs. Kappa
From an image-fidelity standpoint I'd recommend trying out VBR with a quality setting of 8, and consider a softbox lighting rig. Your webcam doesn't seem able to keep up with the low-light conditions well, which makes it look grainy and blurry. In-game, the fonts appear to be a bit mangled by the downscale for some reason (especially noticeable on the bottoms of characters), and it looks like you're getting some frame-drop issues; might try lowering the bitrate to around 2700 if it's network-based to give yourself some additional safety margin (would need to see a broadcast log to see where the drops/lagged frames are coming from though).
