Invest a few bucks in a matched set of tires. Try Yokohama Avids, either V4 or H4 (the V is a little stiffer in the sidewall), for $70-$75 a pop. That will at least take away one variable, the mismatched cheapo tires.
"Think of it, if you like, as a librarian with a G-string under the tweed." Clarkson on the Mondeo.
