I’d say most boats are running 5-6’ leaders. It’s a leader length that puts the offering at the right depth in the water column. Now if you see Leo with 10’ leaders then that’s flossing. Also a flossed fish will be hooked from the outside in instead of the inside out.
Drift eggs, beads, sand shrimp, and number of other things, just run the right amount of lead. Float anything you want and you’ll hook fish as well. If the water is at 9000cfs or less fish seem to be in all areas but if the water is up (11000+) they tend to run close to the bank. I do better in higher water on the cowlitz swinging 50/50 spoons close to the bank. One thing I can say is to take one setup down there instead of 4 rods for 4 different techniques. You’ll never be proficient at one technique until you force yourself to just use that one rod till you catch fish. It’s rarely the case that the fish are only biting one lure. I would of never been as good at spoon fishing if I hadn’t listen to a old guy tell me to just take the spoon rod and a box of spoons till I catch fish. Flit fishing is the training wheels of river fishing, drift fishing can be a pain in the butt for all anglers and swinging lures takes time to learn where your lure is in the water column.