High speed stability issues

I agree with more air in the slicks.
So when your at the top of the track and it gets your attention! Does it feel like the rear is getting loose or that the front is not responding to your steering input.
If the tail is wagging put more air in the slicks(13-14 psi) and if that helps but don't fix it. add some weight to the trunk and see what happens.

I think getting the air from under the car(front air dam) is the answer.
If your fiber glass hood has a crack in it, at 130 mph, your going to loose it. BUT its not the problem.
Just my logic or .02