you need to put as little of that compound on as possible. you also should have 2 of those fans as intake fans. if i read it right, you have all your fans in exhaust, right? you need to have intake fans, so you get cold air into the case. hence, getting good air flow.
1 intake fan at the front of my casing, another at top of it.
The 2 side fans and another at the back of the casing which is exhaust fans.