I don't spend much time on Hartwell chasing gills. Because of the traffic in the summer I go to the smaller likes. I love my fly rods while fishing for bream and if looking for them deep I look on the flats and channel edges for the fish to show on the DF. I have fished these small lakes enough to know where the stumps, brush and so on it at so if I see something on the DF I know it is fish. I like to use a clouser and some of the 1/80 and 1/00 jigs on the fly rod counting them down. The drop shot fishing does work great with jigs or live bait and so does a nightcrawer on the bottom.
I would say the biggest thing to do is to learn your fishing places and know where the cover and structure is so you will know when you see something different on your DF it is fish or bait. I have a friend the fishes the west coast lakes and he fishes in deep water (50 to 80' depths ) and only uses 1/80 & 1/100 jigs on the bottom. He waits for them to drop to the bottom and he catches some of the biggest gill I have ever seen.
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Ascend 133X 13' - MotorGuide Xi3 & Mercury 4