you really shouldnt mix tires. the hankook's are directional, and the potenza's are non-directional. it doesnt make that big of a difference, but coupled with the fact that our cars are RWD, makes things really unsettling when you mix the tires that way. suck it up and buy new front tires.
also, yes, tires need to be worn in. give it a few hundred miles and see if it improves. if not, then you will definitely need new front tires that match
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