Doesn't anyone realise this may well be down to how fish are feeding. A group of fish feed a lot more vigorously than maybe a singular to two fish. Bigger fish tend to either swim alone or with one maybe two other fish. If you watch how they feed they are a lot more cautious.
What I'm trying to say, maybe this has nothing to do with the lead set up, maybe it's more to do with the hook end. Try a pop up, an instant grab rig rather than a balanced or bottom bait, it might just be the little tweak that changes everything.
It's very rarely lead set ups that cause losses, it's more down to presentation, ie, bottom, balanced or pop up and hook sharpness.