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First off, let me get this one out of the way, I hate Carbotechs, and always had issues with them. Are the pads bedded properly? Carbotech has specific directions on properly bedding them.
I'll notice a "soft" pedal after a cool down lap going into a hard braking turn, as the pads have cooled down significantly, but usually 3 to 4 seconds in the bite gets progressively better.
Soft pedal sounds like a fluid issue. There could be air in the lines or you could be boiling the fluid, but I don't think Lime Rock is the kinda track that would boil fluid. I ran ATE at Sebring on all my cars without issue (CTS-V, Miata).
If the pedal feels still kinda firm, but theres no bite, pads could be glazed. Take them out, rub them against the concrete, and re-bed.
One thing that not a lot of people think of is pad knock-back, which I had an issue with on my Miata. It is when the lateral movements through the corners will push the pads out from the rotor surface, so when you go to the brakes, pedal goes to the floor for the initial pump, and is definitely a butt-clencher.
I do a light brake tap in the straights before the brake zone by habit after my Miata race car, so I wouldn't know if this car had that issue or not.
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