Karl - Glad to hear there is no "day-after" damage to you as you seemed good at the track. The car in front of you was mine, with my wife driving in the Yellow group (I instruct and run in Red). Having run 1000's of DE and Racing laps at Limerock I can offer a couple things, please take them for what they cost.. nothing!
1. You were running a very light car on Michelin slicks. They take a couple laps to get anywhere near maximum grip under the best of circumstances.
2. You came over the peak of the hill under power in a light/powerful car while still giving some steering input. If the wheels were straight or even better, had some counter-steer applied you may have steered out of it. In my car 185HP/2700LB I automatically have counter-steer input at every crest of that hill at around 90 MPH.
3. You appear to have lifted off throttle the moment the rear started to go, trailing throttle oversteer may have added to your predicament. Staying at least neutral on the throttle may have helped.
Here's to you getting your beautiful car back together soon and incident free track days!
Best,
Gary