You'll def. wanna add to your arsenal. Only have riggers is limiting your catch rate. As far as only catching smaller kings, it could just be the location you fished. You'll get bigger ones as the season progresses. Simply adding leadcore, copper, wire or braid dipseys set ups will give you another dimesion to your spread. Sometimes its a rigger bite, then its a dipsy bite. Copper can be deadly too. My advice if you're a serious salmon troller would be to go to a quality baitshop and ask them to set you up with a couple dipseys, flasher fly setups, spoons etc. Most bait shops have charter captains or ex captains working there. Just be sure to ask lots of questions and bring your wallet. This is a very expensive sport. It will take you years to figure it all out. Lots of researching on forums and googling helps too.