My buddy/mentor sets his transducer up two clicks so he can see the splashdown of his jigs. He rarely fishes straight down below the bow of the boat, so he sacrifices a few feet behind the transducer for the ability to see his jigs "splash" and create bubbles on entry into the water. That helps him estimate whether or not his "flip" (cast) is far enough beyond the target brushpile and lets him track the decent of the jigs as they fall towards the brushpile.

Generally, we usually find the quick biters hovering over the top of the brushpile. But, it also seems like the bigger ones are down in the pile and/or around the thickest branches. Well, except for those solo wanderers that like to stay out in open water.