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I'd suggest the opposite, trying 17's with performance tires, and at least another half inch of width to fully support the tires - the reduced weight will help more than the stiffer sidewall on 19's (and those 19s will be ADDING unsprung weight - something I find mine is very sensitive to). I'm finding the Bridestone s007's to be an excellent step up from the Conti's, much better dry traction and shoulder wear-resistance with almost no reduction in wet-handling.
And this is very true: "on the road you can’t be too stiff and you can’t be too sensitive. " If you go too stiff, you'll lose compliance and be bouncing along rather than holding the road. Don't buy the magazine hype about 'flat cornering' being the ultimate goal; a tire has zero grip the moment it leaves the pavement. Street driving will seldom put the car up against its ultimate limits, so you want to focus upon driveability and consistency rather than things that raise ultimate limits a few points.
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