Sam,
I chase kings as well around Sydney and am experimenting with stickbaits. I have the same saltiga dorado(85gm) plus the smaller ones too. I used the smaller floating version and it did waddle and roll around alot . I guess it mimics a wounded fish. Works on sambos, and Im guessing will on bonnies too. Havent tried my sinking one yet.
I have also used floating runbohs and sinking orion bigfoots. The spot I used them, you can see the kings come up. On the orion, it swam up to it, but then turned at the last second. I have feeling it saw the line as it wasnt flurocarbon. But will be using fluro when slow working these types of lures. I havent had a chance to play around with all the lures and experiment to see what speed works best . They can be a frustrating type of lure if you can see it and are waiting for it to sink a bit before some swell rolls in. I have a fair few different types now and will be taking more and more with me now that the kings are coming on stronger in numbers.....