Take the time to hit your target the first time without repeated casts. Just remember you are not fishing with artificial bait, so let the shiner sit and do his job. Balloons and Bobbers Keep them small, only large enough to keep up with, where, and what is happening on the other end of the line. Three to four foot depth in most lakes allow for free movement. As far as bobbers or balloons, I personally like the camouflage colors, so as not to distract the fish.
Free line works great in running water or for trolling.
It also works better in deep water or high skies days when fish do not want to come up. Carolina rigging in running water will normally blow your mind, it requires constant contact with weight in order to distinguish hits. If you know where the fish are, be sure to set the boat up properly first time around in order not to spook them. Have adequate rope and heavy enough anchors to hold fast. Lock boat in front and rear with anchors to prevent shifting.