I've had the same problem with my S8 and have just bought a second hand set of 18" wheels (I think you'd struggle to get 17" rims on the S8, but I'm not an expert. I'm waiting for some winter tyres to be fitted, but simply having more rubber has improved the grip. There was a post a week or so ago on tyres that included a link to a review on winter tyres. I'll see if I can find it and come back
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