Instead of running one large set, try experimenting with smaller, lighter flashers. Once you learn their trolling depths, you can select a set that you can fish slowly right near the bottom, where the fish are, on a long enough line to ensure stealth. While an electronic depthfinder is not essential for flasher trolling, it allows for a much more accurate presentation, and most trout, whether deep or shallow, come to your flashers not when they trolled are in open water, far from the bottom or shoreline structure, but when they come within a few yards of fish holding rocks, shelves or underwater points. Reel back in now, stupid, because we forgot to tie anything with a hook behind your attractor blades. Worms must be trolled at the lowest speeds only, or they will bunch up on the hook from water resistance.
Lures also work well behind flashers, with the only real limitation being speed.
The lure must work well at low speeds to be coupled effectively with them. A trolling spoon such as the Needlefish or Krokodile is another popular choice, but my personal favorite artificial lure for flasher trolling is a wide-wobbling plug. Flatfish, Kwikfish and the Rebel Crayfish are all effective, with body shapes and action designed for slow speeds. Fallen Leaf Lake mackinaw. The Fish Sniffer.