FWIW Dog... I run the Metzelers and same thing happened to me. After a long trip split between interstate and backroads at about 6-7k, I found the tire was flattening in the center. I thought it was a manufacturing issue. I am on top of the pressures and always run 41 F / 43 R. After talking to a few friends about it and adding more miles, the flattening reduced and now I have 13k on those tires with no issues. Front is on the wear bar so it will be replaced soon. Rear looks like it will go another 4-5k