I had Kuhmo 712 225/40-18 and my car was all over the place. I couldn't keep it on the road it was so bad. It was like driving on pavement that is deeply channelled from the semi-trucks driving over it too much. This was with a fresh alignment too. After a week of this, I went back to discount tire and they swapped them out at no cost for Continental Extreme Contacts and now I am VERY happy. The Kumho did grip extremely well, but I couldn't drive a 1/4 mile on the highway without it trying to jump into the other lane and I drive 60 miles a day on the highway. It was just as bad in city driving as well.
Enough about me..... your wheels look great and I hope the Kuhmo's work out for you.