I wouldn't target kings with anything less than a 9. Keep in mind many of them are going to be over 20#. If you let them get downstream of you in a heavy current it's usually "game over" no matter what rod # you use.
I have had the best luck with fish actually taking streamers on the swing all the way down in the Meadows at DSR. I think many of the people upstream are lining fish more than anything else (hook on the outside of the mouth).