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No offense OP, but if your skill/knowledge level is "are 17s better than 18s?" you are exactly the kind of person who needs to spend some time autocrossing the car on stock tires.
Grippy tires will mask your mistakes. They will allow you to develop bad habits that "feel" fast but are actually slow. Stock tires will punish you for every mistake; the understeer is trying to tell you something. You can either try to learn from that something and become a fast driver, or you can bolt on grip and pretend you're a fast driver. I won't judge you either way as long as you're honest about it.
Very little of your canyon experience will translate to a 10/10ths autocross environment.
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