Use the very short screws and mount the radiator directly to the case, same way as the psu is attached. Then use the longer screws to mount the fan to the radiator, the fan will have the good side facing you, and the small arrow on the side of the fan will be pointing towards the radiator. This blows hot air out of the case, the way you have it mounted blows hot air into the case, which having no exhaust just overheats everything, especially your gpus.
The way you have it wired is correct for Corsair's instructions, but not necessarily great. Cpu-opt on most low-mid Asus boards is a permanent, non controlable 12v. This I find perfect for clc pumps as it negates any user interference, it'll always run 12v max speed no matter what. This means if a fan is installed there, it runs max too. I have the h55, and use fan on cpu_fan, pump on cpu_aux so I have fan control. Either way works the same, its up to you what your prerogative is.
As long as the pump is 100%, the fan will work at maximum efficiency for its speed. If the pump is less than 100%, the hot coolant doesn't get moved off the cpu very fast, so your temps go up.