About a year ago, I was in the same boat you are. I was still working, for a large auto insurance company. They have a department that preforms tests on different auto items, including tires.
I was able to talk to one of the test techs, and was told that Sumitoro tires did not have a favorable rating.
With that info, I chose something else.
Grumpy and Mrs. C.
From the corrupt state of Illinois