"I replaced the stock fluid with Motul high temp fluid, but everything else it totally standard."
That's very impressive that your pads are stock. That braking zone for turn 1 is no joke, and I get nervous braking at 125mph at the 500' mark. I couldn't imagine going over 140. I'm Llamawerkz on Youtube by the way. We've exchanged a few posts there.
Impressing the instructors on braking capability is pretty cool. They're almost all Miata or Porsche guys (the instructors). Maybe cars like the ZL1 will convert a few