You may just have had too many fish charging around your swim, and dependent on how you were feeding they may have been up in the water, both of which can cause line bites, and subsequent striking ends up with foul hookers, I would look to fish a shallow rig to see if the fish are up in the water start with the shallow rig 6" off bottom and keep shallowing up till you start getting positive hook ups. if you dont get indications at 6" off bottom its unlikely they are up in the water, then try with your depth rig just off your main feed area.
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