The last image that you posted seems to suggest a slanted piece directly below the bumper.
From what I know ( almost nothing ) of good aero., this would deflect the air downwards and cause it to make contact with the ground - bouncing all around and causing all sorts of turbulence before bouncing back upwards and hitting the supesnsion - causing even more drag.
Also, a front end like this would add a considerable amount of front end lift at high speed ( unsafe ! ) You would notice that the car would seem to feel 'squirrely'.
Perhaps you could investigate trying to have the air flow to the sides of the vehicle instead.
