After trolling for a while,you will start to see patterns of what leads work best for certain lures or divers.We often have 3 people fishing on board,so have 6 lines out.We will run 4 inline boards and 2dipseys at a 3setting.We frequently run harnesses off #2 tadpoles.After several years of running the tadpoles,i remember several leads that frequently catch.The leads are 37,45 and 60.The dipseys actually run pretty close to the same leads as my #2 tadpoles.Last week 40 and 45 on the dipseys were catching.This season,we have been running stinger spoons a lot more off my #30 true trips(TT).One lead for my 30TT has been 65 lead.Another popular lead that worked was a 50 lead when using 3oz sinker with my harnesses in water that was around 40fow.One thing in common with the leads that catch is that the depth they are catching is 2/3 or 67% of the way down in any water I am running.In other words,if fishing in 30fow,make sure you have a lure at 20ft down.If in 40fow have one 26ft down.Works a lot of the time.