I agree with Chris... when you see kingis on the screen, I drop to the bottom, then work to about half way up. every 3rd crank, I bring it all the way to the top if no-one has hooked up (not very often that happens). By that time yuo are usually off the fish anyhow so it is time to circle around for anotehr shot.
Personally I think that the bigger kings roll over and hoon off after the jigs as they drop down thru the school, and then nail it on the way back up again. I think the rats tend to hold in denser masses nearer the top.
If you start getting bored with no hits down deep, it is always fun to bring the pack of rats to the back of the boat with shallow jigging, then at least you see all the fish and everyone, especailly the newbies, just have a blast seeing all the fish.
Finding the kings here at the moment seems to be a prob though... everyone I have talked to these last coupla days are cmplaining about the tons of bloody cudas out there still!
I agree though, a nice colour sounder is a marvellous tool. Be lost without mine!
cheers, Stu.