So why are they still running 1000 feet over 1320'? I don't know the answer (I do have some thoughts), but I don't believe the problem lies with the car, it lies with the track.
They don't all necessarily run 1000 feet, either. Tasca and Worsham, just this morning, ran 4.73 and 4.71, respectively, to 1320 feet, the times that came up on the boards. That would indicate both drivers ran their cars clear out the back door, for whatever reason, without too much concern for chute issues or shutdown length, either.
That race will fuel a bunch of new 1320 VS 1000 arguments, I'm sure, since Tasca was first to 1000 and Worsham was first to 1320.
The first, and simplest, thing to do is to require TAFC and TAD cars to install the auto shutoff device - and go from there.