S hit, man - sorry to hear it.
It's what's known as an S2000-specific Diesel spill on the road. Only it must've been NSX-specific Diesel, if other cars weren't affected at the same spot.
1. The dealers have reduced your rear toe-in or camber settings (or have increased front grip) , so the car is twitchier than you are used to (before/after printouts?) and you didn't have long enough to adapt to it.
2. Dealers invariably let down my tyres, so probably do yours. That would make its responses less sharp.
3. The tyres are sensitive to wear; they tend to go 'off' once the sticky tread has gone.
4. It's very greasy, Auntie. Jenny! One gets used to throwing the car round like a toy in a dry spell and its limits are a lot lower in the wet. One needs to adjust until the roads clear of rubber/oil and you probably didn't.
If it's any consolation, I expect several hundred S2000s are being reversed through hedges as I type. They will all be blaming S2000-specific Diesel instead of greasy-road/driver error.
I hope you get it sorted painlessly. Especially after throwing so much dough at it of late.
Nick
“I find myself irresistibly attracted to cars that nobody else buys. The NSX is a classic of the genre because nobody buys it and yet it’s a fantastic car. It’s got a wonderful compactness and simplicity and unpretentiousness to it. Honda rudely continues to make them whether we like it or not, even though there can be no commercial logic in doing so — I thoroughly admire that.” Rowan Atkinson