You should at least turn that side fan into intake, no matter if it is high (to hit ontop of your Heatsink), or low, to push in some nice cold aire and pressure more out of the other fans.
About the vibration, make sure your case screws are firm and if that doesn't solve anything. Try starting up with a fan unplugged and see what happens, and then try a different fan...etc - you will find some solution.
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