A key part of the problem is how to regulate the aero, without become over prescriptive and killing all opportunity for differentiation and innovation.
I have been wondering if it would be viable too simply enforce a limit on the total aerodynamic downforce generated (to be defined as the total force exerted on the track minus the vertical acceleration times the mass of the car). The aero gurus, can then still compete on trying to generate the maximal downforce at all speeds while minimizing the drag. Because the focus shifts to minimizing drag, the cars should also produce less turbulence, while being less susceptible to the negative effects of dirty air.