Do not want to discuss a vehicle pushing or being loose. But believe Nascar does regulate springs, and possibly shocks. Maybe not the rebound percentages and such on the shocks but the bump stops have been regulated.
I would rather they go back to spring and shock choice by the driver or car chief. NASCAR can have an approved selection...say 1200#, 1000#, 900#, 800#, 700#, 600#, 500#, 400#, 350#, 300#, 250#, 200#, and 150# springs and four different shocks for the front and four different shocks for the back...sealed with no valve customizing. Raise the minimum car height, keep the low drag rear spoiler, get rid of the track dragging front spoiler with a chin spoiler like on a street car, but allow an inch lower front ride height than the rest of the car.
Then let 'em go at it.