For Hyper 212+, apply the paste like so:
Note how the cracks are filled in, and the main paste application are the 2 (or in the case of the 212+, there's 3 to make) lines. I think for the EVO the gaps are closed now, but see if you can fill them in. And like others are saying, make sure its tightly bolted down.
As for the second fan, remove it. There are tests that show the stock single Blademaster on the 212+ is best performing and best for your money (that means adding a second Blademaster isn't really worth it).
EDIT: how are you connecting the second fan, btw? If its getting too little voltage (from the mobo and not via a Y-splitter) it'll be extra turbulent in the HS.