[Varn]

So the rain was moving from higher pressure to lower pressure?

The air flow toward the midline of the car was air that was moving toward a lower pressure zone when compared to air at the base of the windshield?

This could mean that I have reduced the pressure on my windshield over 3/4ths of its width.

The hood slope on my car is 7 degrees from horizontal.

Originally Posted by euromodder

The idea behind such a hood fairing is to more gently lift the air over the windshield.
It very likely means you're redirecting the air either way of the fairing, and now have higher pressure on the left and right parts of the windshield, which then partly bleeds off over the sides, and partly towards the center.


The higher pressures from both sides converge, combine with the uplifted airstream going over the center of the hood fairing, and blow off to the area with the lowest pressure : over the roof.


So basically, most of the air still seems to be hitting the windshield hard.

See if you can find some more coroplast, and widen the fairing in the center.
The moment you're no longer seeing concentrations of air drops being spread out, it's wide enough to either lift the air that carries the drops up & over, or move it off to the sides.