I find your Xin jungling video very uninformative, didn't cover good masteries or runes, nor a good route. Also I noticed in the very small amount of clips you had actually showing him killing jungle creeps you were not activating his q correctly. It is kind of like Trundles Rabies in that if you activate it IMMEDIATELY after an auto attack you get another attack nearly instantly, however if you time it poorly and activate it just before an attack or during one it will actually cancel the animation and restart it slowing your attack speed.
We both know I disagree with your opinion on jungle Xin, I did not come here to harass you because we disagreed in another thread I wanted to look at what you were doing, compare it to what I was doing and see if I could help you / learn from what you were doing. However with almost no information on what you were actually doing (as far as route, masteries, runes initial clear time, and skill order.) I commented on what I was able to gather from your video.