My first set of Kendas wore great and I got near 20K miles from them. The rear wore nice and flat but my 2nd rear tire looks way worse than yours and I have only 8Kmiles on it.
I came to the same conclusion as others have stated, that the tire elongates while at highway speeds. To me this means the tires being produced are even of lesser quality that what came on my 2010RTSE5.
We are into the rainy season here in South West Florida and I am not comfortable with the rear tire as is in the rain.
I have a General Altimax RT43 sitting in the garage that i will install myself this coming weekend.