Hello,
Is the undercarriage in the engine area lower than the bottom of the lower grill? Maybe you can integrate a chin spoiler/air dam under there? It might help a smidgen to angle the upper block back to the headlights, eliminating the side gusset triangle; forming a bit of a "point" on the upper part of the nose?
What is your tire pressure? I would try a foam gasket all along the front edge of the hood to seal the gap.
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