Went back and spoke with tech at Discount Tire who did the install. Seemed knowledgable and said he put the same tires on his wife's car (Lexus) a few months back and it felt the same way the first few days but now they feel fine. If it doesn't correct itself over the next week they agreed to put different tires on the back or I can obviously choose to buy new YK580's for the front also. Then I'll know it's not a mismatch problem, we'll see. But I'm also amazed that I get the VDC light in a straight line pass with new back tires. I never got this even with the old stock tires with 25K on them.
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