I take it has never acted this way?
Ok, first off, eliminate the use of the 2step for the time being. It is exasperating the issue.
It looks like you're running out of shock travel on the rear.
How many runs on those tires? I've seen tires hook good, then get at the edge and never hook again. Even with indicators left.
I've heard the guys in Div6 take care of the surface up there, that still true? How do you feel about the track? I don't see a lot of gloss.. no VHT?
BTW, love the car.