Getting this stuff figured out, both casting and trolling.
I still need to take some photos and post, but we've caught enough fish to learn some lessons about streamers, both for casting and trolling. A "jigging" motion adds notably to the catch rate. Kings can't seem to resist a falling fly, no matter how brief. Even trolling. Pull the fly slowly forward 2 or 3 feet, then drop the line back quick so there's a brief moment of slack. With a weighted head the fly tips down briefly even while trolling. Easy when hand-holding a rod, and as it turns out, easy in the rod holder. Just grab the line and pull in 2 or 3 feet, then drop the line and allow the fly to fall back. A high portion of our hits come as the fly is falling back.
I've started tying our streamers with the large size Fish Skulls, silver for herring and olive for needlefish. The large size is supposedly good for the 3/0 hooks we prefer, but some brands of hooks have eyes too big. Double check before tying.