“If you want more air-- I'd open up the deck lid rain tray or put a hole behind the license plate or both. The theory can be tested by having him drive around with the deck-lid popped a few inches (held open with some gizmo or other). 5 bucks says it'd help.”
I agree with Stan on his thought above. I too monitor all 4 CHT and the elec cylinder opening deck lid approx 3”, as well as cut opening behind license plate made a difference on 95 deg + FL days.