Hi,
The fan are set to push the air inside the case to out or in?
I have Corsair H75, honestly I never applied any thermal paste because it have on already (i think lol) but my temp never goes more than 55 under full load gaming. However, I have two fans front where set to push air inside the case while the CPU cooler to push the air outside the case.
Also I would make sure the cooler pump and fans connected to the right ports on the MB, beside that can you check the fan speed when you try to open a web-page and gaming for example and see.
Regards,