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As a fellow road course guy I feel your pain.
The truth is that once you modify the car GM will not warranty anything. The car needs to be completely unmolested. I've been told that GM will even make the dealer send pics/vid before approving warranty. Not sure if that's true but I wouldn't put it past them.
Second, I do about 15 HPDE per year on average and I'm at the bleeding end of the Race group. Things are gonna break and truth be told, at our pace, engines get torn down regularly for inspection/rebuild. If you're running any type of performance package and not inspecting your engine every 3 months you're asking for trouble.
Jannetty tuned my car which is essentially stock plus a Magnuson 2650. It makes just under 700hp at the wheels. I would love a cam (not sure if the Callaway package added this), but I don't want to risk the increased service/inspection intervals. I'm on the fence. No matter how good the tune is you just can't get away from shortened service intervals.
Just a couple of questions:
1) How did you manage to wear through a clutch at 11k miles? Is it aftermarket? My car has 55k and the OEM clutch is perfectly fine.
2) Regarding your toasted Knock sensors and harnesses, are you running 2" headers? Are they ceramic coated or heat wrapped?
Given your use case, I'd probably look into picking up a used LT4 and going back to a conservative state of tune, then build from there gradually. Something with that engine seems problematic based on the symptoms/description that you gave.
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