Another thing people typically don't know is after you've been at the spot for awhile, the visibility on the bottom is at or near zero. Your and other's rig lead weights have stirred up the bottom (which is usually mud or silty mud or silty sand) from constantly hitting it. The perch aren't feeding by sight, they are feeding primarily by smell and vibration or movement. That's why you need to give them that second or two of slack line time to locate the minnow. Even if there is some bottom visibility (poor vis). I have a theory that fishing on one side of the boat is sometimes better because the bottom water current is moving the stirred-up poor visibility water. When the boat swings one direction, it moves that side of the boat to the clearer water up current. Or maybe the opposite.