Chuck ... when I'm Pushing jigs out the front of my boat, I'm using a max of 4 rods ... each with 1oz trolling sinkers and 18" leader lines, and I run the boat at about 1mph. I use line counter reels so I can quickly get my jigs back to whatever depth I want. I use the right triangle theory to put those jigs at the desired depth .... basically: for every 5ft of line below the surface, the jig will be 3ft deep if the angle of the line is approx. 45deg. Mine usually aren't at 45deg, but that lets me err on the side of being a little shallower than what the mathematic formula dictates. I'm actually calculating the depth in my head by multiplying the length of line out by 0.6 to get a little more accurate depth. So if I have 30ft of line out, the jig will be close to 18ft deep if my lines were at a 45deg angle .... or with 20ft of line out the jig would be about 12ft deep. (20x0.6=12)
If you have a trolling motor that has variable speed control, you can maintain a steady speed. I don't, so my speeds vary from 0.7mph to 1.2mph (depending on wind/waves) ... so my math/depth calculations can fluctuate, which is why I err on the shallow side of the line angle.
I started out using barrel sinkers on the main line with a bead & duo-loc clip .... but went to trolling sinkers and duo-loc clips so I could more easily change weights if need be. I did try the Capps/Coleman rigging, where you wrap the leader line several times thru the barrel sinker, but found out real quick that you lose the weight along with the jig, a lot of times, when you hang up & break off.
My main lines are either 20# mono or 30# braid ... and my leaders are usually 6# mono.