Cupping on inside of rear tires
I own a 2011 Mazda 3s Hatchback with ~67,000 miles. I am the 2nd owner and have put ~50,000 miles on the car myself. I recently purchased a set of new tires and had the rear tires rotated to the front as it was time for a rotation at that time. A wheel alignment was also completed and it was stated that the toe was a little off. When I started driving I noticed the ride was harsh and loud. Inspecting the tires I noticed cupping on the inside of both tires with the tread block being cupped the most at the rear more than the front.
My questions are:
1. I believe the tires were rotated and auto-crossed but I am not positive
2. Will the tires being in the front be worn more evenly?
3. What would cause the inside tire cupping in the back tires only?
It is my understanding these cars are tough on tires and I had put over 10k on the tires (mostly highway) since last rotation.
Is this wear expected for these cars as some people have said or should I look at something else such as replacing the shocks?
All advice helps, thanks!
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