After watching the 500 this weekend i noticed while looking through their hood cam that the hoods on these professionaly built race cars flex and wave the same way ours do (just at different speeds...) so could end up being more of a wind sucking the flexible hood up issue (like blowing across the top of a piece of paper) than a problem with engine bay pressure 
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2013 Argento FR-S -> Lots of random PlastiDip, UNIChip Custom Tune, aFe Takeda Intake, Nameless Performance front pipe and axle back exhaust, Motegi MR125 7.5x17, Rally Armour mud flaps, Gloss black vinyl roof, ACT street clutch and flywheel,Whiteline bushings; Kartboy Shortshifter and shift bushing
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