Sleveritt, I am sorry, but I think you have gone in the wrong direction with this.

The amount of engine cooling you need is directly related to the amount of power the engine is producing.
The fans are there to help the increase air flow through the radiator when you are travelling slowly, or stopped in traffic. At these times, the engine is not working hard, but the radiator still needs air flow. What you have done will possible help in this instance.

But by far the greatest amount of cooling is needed when you are travelling at highway speeds, uphills etc, when you have the gas pedal to the floor.
At these times the fans do little, or no work at all.
The air flow through the entire radiator frontal surface caused by your forward motion is enough to cool the engine.
The cover plate you have installed will reduce this air flow by around 50% by the look of your installation.

Bottom line is that I think you will overheat on extended highway driving.

I hope I am wrong for your sake, but have a plan B for getting home the first time you go for a long drive.

Regards

PK