Cannot answer on the KK, but in the past with a K, I just opened the top damper and bottom damper all the way till I got about 800. Then I just slapped the steaks right on the main grill for 90 seconds per side. Shut the dampers and let it dwell for a few more minutes till medium.
My first searing experiments started on a home made sear grill, but if you let the fire get to big, your gonna loose arm hair - hehe - if your lucky nothing else. Though using a sear grill will be faster, use less charcoal and not make you have to get your grill up to that high temp.
So you have more than one choice, choice it up to you. Either way, just get plenty of flames on the grill and sear it for 60-90 seconds per side, close it down and dwell till desired temp.
-=Jasen=-