nylineman,
For the fish down 50ft. I would recommend putting the rigger 3-5 foot above the fish (fish normally look up to feed). If you are fishing lakers, you will want to troll slow (less than 2.0 mph.). My rule of thumb is 5 - 50 foot down run leads 60 - 100 back. Any deeper, you can run them 10 - 50 foot. Try trolling Sutton spoons. They are made in Naples NY. What body of water are you fishing?