I run harnesses behind inline boards and if I'm targeting the 30 foot range at about 1.5 MPH or less I would be back about 50 55 with 2 oz bouncers. Best bet is to let it back slowly and when you first feel it tick bottom bring it up slightly if you are targeting the bottom. If you want to be up 10 ft off the bottom you may have to reel in about 15 ft of line to take into account the angle of the line. I don't usually think of how far down the walleye are, I put my hat on backwards and think how far up from the bottom they are. I seldom run inline weights or snap weights with harnesses. Most of the time you will find the eyes suspended just off bottom, but at times they will be anyplace in the water column. This method has the lines not far out and about at a 45 degree angle. Most of the times this works well, but at times a lighter weights and farther back offers a different presentation. Everyone finds a method that works well for them. With walleye speed is very critical. Sometimes pulling harnesses we will be around 0.8 MPH. I tie my own harnesses and make them 4 or 5 ft long. I'm going to be trying some 1 and 2 oz Dive Bombs this year. The Stinger reps told me to expect about one and a half times more depth per oz using the DBs. I wish they would come up with a dive curve. Like always, "Find out what they want and give em lots of it".