im going to disagree with both of you. theres always an advantage in aerodynamics.

if you're past the limits on your suspension without aero, then you're past it with aero even moreso. You need to consider aero in your suspension setup, its the same as if you had that weight in the car.

tires though will always benefit from aero. And it doesnt matter if its a slow corner or fast, the more aero you have, the faster you can go. the faster you go, the more effective your aero. . .it just keeps helping you.