I recently (1 week ago) installed a CM Hyper 212 EVO in my PC. Resting my hand on the top of my HAF 912 case, I can feel a slight vibration where the cooler is, and I can also feel it when I have the case open. I know I fastened it well - is this normal, or am I missing something here? I'm using the included fan, so the rubber shoes are there.