When I pull lead, 90% of the time I’m trying to saturate a particular depth zone (say, bottom to 5 feet up) with as many baits as possible. In other words, I want all of my baits in that zone, rather than 2-3 high and 2-3 low.
Here’s what I do to avoid the tangles that would occur if I ran 4-6 lines to the same depth using the same amount of lead: I run my deepest diving baits, like SR7s, JSR7s, or SR9s, off the inner rods and baits that dive less aggressively (SR5s or the like) on the outside. I am still able to get all of my baits into the zone I want to saturate, but I do so with less lead out on the inner rods and more lead out on the outer rods.
If I want to look for high-riding fish, rather than stick with lead, I will run a pair of long lines in front of my lead spread. Thus, my farthest forward rods will be long-line setups, pulling something like an SR5 or a JSR5, 175-200 feet back. That will put those baits well behind my lead lines and high above them in the water column. The next rods will be my “outer” LC rods rigged with an SR5 or the like, and then my “inner” LC rods with aggressively diving baits.
Works for me!