Scotty pinch pads are what I use for all coppers. With big 400/500 lines I can easily adjust the depth I want to run them at with a SmartTroll in line, telling what depth the point is at. This way I don't have to count marks on the copper and more or less guess what depth I'm at. The SmartTroll's do have a price attached, around $1,200 to start, but with the limited amount of time I have to fish they are well worth the cost. You can run up to 6 in line and signals back to your Android device.