I made a thread on this same thing but no one on here actually knows. Except 1 person in my thread.
I took it to the dealer because it was over 70 psi at WOT. The tech explained some things to me and explained that this is normal, during WOT events.
I watched a couple of ZL1 videos and saw the same thing you've seen with the SS cars.
You can read my thread here, the last post explains what I found out
https://www.camaro6.com/forums/showthread.php?t=546288