[Christ]

Joe, you've sloshed the idea a bit. The OP has determined that flow upward from the read surface of the tires is hitting the area inside the wheel well, just above the 90 degree intersection to the bumpers lower edge. He placed a coanda device in the wheel well behind the tire, effectively training flow spryay from the tire tread down to the lower edge of the bumper without causing it to"slam"into the flat edge inside the wheel well, then be forced outward and around the square edges of the bumper. If it works, it should have some positive effect, similar to rounding the forward edge of the rear bumper, but without actually modifying the vehicle.