Hi,
The edges of the belly pan do not appear to be sealed, right? The problem is too much air is getting in -- and there is almost always too much air "trying" to get through the radiator. I think on many cars that you get better cooling by blocking off some of the grill(s). Some of the openings on the grills on this car seem to be well away from the radiator, and the upper grill is there for style.
I think that ~half of the lower grill should be left open and it will easily cool the car.
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