I have had surprisingly good luck trolling small lures right on the surface with no weight in the middle of summer. Seems as though the trout like to suspend shallow in the middle of the lake. The walleye, I have found, also like to suspend about 30 feet in 60 feet of water instead of on the bottom like every one thinks. I think the key is presentation, dead slow, speed one on the electric motor.
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Carl C.