I was vacationing in Alaska this summer and took a Salmon trip and the guide used a rig similar to this, but larger, called a flasher. It was behind an outrigger and running 60' deep. The water was super clear and the flasher could be seen a long way down. We caught a doz. large salmon and all behind the flasher.
The poles without the flasher caught nothing. I thought then something similar would work on Sandies and Hybrids.
_________________________