Toe-in most greatly affects tire wear, they wear evenly so it is not detectable on anything but an alignment rack. Check the print out from your last alignment and see what they set the toe to.
Pretty much all of the extreme performance summer tires have poor tread life (<10k) although people have managed to get as much as 20k out of the OEM tires. They give the most grip in the dry but do not handle standing water well due to lack of tread. OEM's put these sticky tires on so that they report well in magazine comparisons for things like cornering G and slalom speed.
You can go with an intermediate summer tire like the Michelin PSS, you will get longer life and still have fairly good grip, but not to the same extreme in the dry (but will be a world better in the wet).
Bottom line, it's not the car, it's the tires. The car is very fast and predictable in the wet on the right tires.
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