Wet weather traction on public roads is extremely variable. Vehicles leak oil and sometimes diesel fuel and gasoline. All you need is a slightly oily spot and traction goes from OK to ice-like. It's certainly possible, or maybe likely that the stock tire's wet performance is not as good as the Pirelli you're used to, and I'm a fan of using high quality, high traction tires, but pushing curves on public roads in wet weather is asking for crashes, no matter what tires you're running.
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