You have the holes in the highest pressure area already, well smack in the middle is the highest actually. By looking at those computer model pictures that show air pressure on the front of vehicles you've got the location about right. Check for leakage so that all the air that passes through the hole actually goes through the radiator.
Ajohnmeyer if he is still around, had a cable acuated swinging door where he could adjust the airflow while driving. Cool weather and high speed close it down, warmer weather open 'er up. He was cutting it pretty fine and went to the dark side with an alternator-less system as well as a host of many other more budget friendly mods. Hope all is well with him.
Coroplast under trays next? BTW coroplast can be ordered in black. When the paint begins to chip off you may consider this as a more permanent solution. I am.
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