Hawk22, in all of this discussion I don't see mention of which fans you have and how they are running. The key to good cooling is airflow. Based only on the specs, that NZXT Tempest case should have plenty. There are 2 120mm intake fans on the front and 2 140mm exhaust fans on the top. The side and rear fans make for 6 total case fans, plus the PSU will have a fan as well. Do you have all of these fans installed and running? Are they variable speed fans, or fixed? Either way, are they running at high speed?
Another key to airflow is the balance of intake and exhaust and elimination of recirculation. The 2 front fans should be intakes and the 2 top fans exhaust. This will cause air to flow from front to back and bottom to top. Hot air rises, so top exhaust is good. The rear fan can assist with exhaust. I have never been a fan of side intake fans because they move air transverse to the normal airflow and set up turbulence. I would suggest that you experiment with leaving the side fan unplugged which still allows cool air to be drawn in as a result of low pressure. Finally, the PSU fan is oddly situated at the bottom of the case. If the fan is facing up, it is drawing air down near the back of the case in opposition to the other airflow. If the fan faces down, it might have less of an adverse affect.
As always, you want slightly more exhaust pressure than intake pressure, which is another reason to leave the side fan off. Finally, the only way to be sure of what cooling is good cooling is by experimenting with different fans on or off, running at different speeds, and measuring the resulting temperatures.