I know about the flossing. Hopefully we don't go off the topic of beads.
We use about 20-30 inches of leader with the bead set 1-2 inches above the hook so when they pick it up its not down the throat or near the gills. It has been well documented that the salmon and steelhead do pick them up. Its why they pick up roe, artificial worm, fly's ,corky's , hard lures like spoon, Spinners and my favourite Ghost shrimps. Three reasons I believe . One its instinct for them to eat it. So they are biting out of instinct Even though their throat are restricted not allowing them to swallow. Two I also read an article that they ( salmon ) will try to destroy other competitive salmon fertilized eggs also. Three it pure aggression that something is coming into their space and they don't like it.