My two cents,

I have had great success on K-16 with sardine wraps for big silvers. And can even remember one trip when kings were in the river and we took a limit of silvers on 15's and 16's. I will say they are very effective on kings. Now I would agree if there were only steelhead and kings in the river there would be an argument that you were targeting the kings, but with both present and the regs not stating you can't I say its fine.