you definitely want to troll as slowly as possible - 1kt is ideal.
Often when downrigging, I'll drop the engine out of gear when I spot the kings on the sounder and let the livie swim unassisted amongst the fish - they normally get smaaaaaashed.
with out downriggers, you have to go even slower otherwise the baits skip along the surface and unless the kings are in a chasing mood, they wont get much attention.
try the knife jig idea running down to the swivel connecting your leader to your mainline.
Just remember that slow is best, the kings love to chase their prey, but if they don't have to work as hard they'll be more inclined to attack.
you need to use the sounder and when you see the depth the kings are holding in, you'll then be able to deploy the un/weighted baits to where they are.
In addition, trolling a lure or two that rattle alongside your livies may also attract more attention.
PM me if you have any questions.
Cheers
dan