Thats why I dont like to use flashers for summer kings, and run cutplug herring because of fish coming unglued. The flasher works the barbless hook out of there mouth, atleast that is what I thought it was. For blackmouth I like spoons and attach the flasher to the downrigger and run the spoon close and hardly lose a fish.
I guess I just got tired of fish peeling line and coming off using flashers an dont have that problem as much as I dont use them hardly anymore.