From my experience, at 2.0 to 2.3 mph, a small reef runner out 75', clip on a 2 oz. snap weight and let it out another 75' will get you down in the 25 to 30 foot range, depending on if you are running braid or mono. You can play around with different weight snap weights and troll until you hit bottom to fine tune your presentation/depths. Leadcore can get you down also.