We too have been messing around with many rigs. I typically run a 4 rigger set up with either dipsey's or lead core out the sides. I think there are some days flasher/fly other days it is all spoons.
In the summer, one thing has remained consistant for us. Mag spoon on deep rigger, 20-30 foot lead. Next rigger, flasher fly, 10 foot lead. Then throw anything else in the mix you want. Here is my thought- deep kings are attracted to the flasher. If they do not hit it, as they turn to go back to the bottom, the mag spoon will pick them up.
Here is the trick- we know that different colors fade in the water spectrum the deeper you go. My deep rigger is often down around 100 feet, which means glow/purple/copper/green are the colors that work the best.