I used to blast views with Blackhat techniques , but it results @ your account being suspended. I have some other tactics to get viewers , around like 500 a day if i want to on 1 video while it isn't illegal and there are actually people watching. but i'd rather do not share it. (although i might share a minor legal procedure on how to get more views on the forum)
Also i took a quick look at one of your vid and the first thing i saw which can be improved is your tags, the more the better , the more relevance the better. Well , there is a way to get more viewers but it is highly unlikely that it will result in thumbs up is that you just add tags about a hype in the world etc.
You should also try to make unique video's since when i looked @ that Giant waterdome thingy , i already knew that it was made with worldedit or any other plugin. and if it is not made with that , then sorry but it can be made with 3 simple commands with it.
Your intro is also way too long for smaller videos and lasts like 1/2 of the whole video and that pisses people off (and yes i'm talking about that 9/11 thingy , it lasted 27 seconds of the 57 seconds).
And the biggest thing , it is actually quite boring to watch.
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Oh yeah , i have one technique. but i doubt you have a gameserver on any source game. I force url's on people ingame so they visit websites like youtube etc.