Might also consider using a color or two of lead sandwiched between 8 or 10 lb mono. This lets you present far behind the boat and still get a lure or fly down 5 or 10 ft. My biggest rainbow of last year was on an orange tandem fly and this set-up in May. I cannot take credit for this, Travis suggested this for spring trolling when I first met him on a charter in Aug 2005. Hope this helps to get you into a few fish.....

Tim