Run a Fish Flash from Big Al's Tackle off the down rigger ball. Clip your line about 6 - 10 feet above the ball and use just a spoon or a Baitbuster, something to give you action. This set up is nice because when you're fighting a fish, you're not fighting the flasher because it's connected to the ball.

Always troll from 2.5mph to 3.2 mph.

Also, don't be afraid to try purple.