If there is not a shad population in it they are likely chasing minnows, or bugs. Try some of them itty bitty baits by Bobby Garland. I would swing black/chartreuse, sweet tea/lemon and tadpole at em. If there is shad same color variations just larger profile bait. Doubt your line is bothering them, but could try a flourocarbon leader if suspect. But I betcha them itty bitty's get bit. Couple slews round here I stroll into in my kayak that them itty bitty's wear em out cause there is no shad gettin back there and they are chasing them mosquito fish and water bugs..