Yes a few knocks were registered on rod tip, most I know would've resulted in hook ups if fishing a bait on the hook.
NOT striking at the knocks is whole point of a self-hooking rig surely and as with any missed struck at bites you'll spook the fish and fishing with a long hair, your hook is so far away from the fishes mouth unless the bait has been taken fully its futile to strike and if taken fully it should hook up, self hook or nothing!
You'll also find that when a fish is hooked up it'll spook the hell out of others present in the swim. Time and place for everything, IMO the time and place for hair-rigging for chub, is where few bites are expected and the fish are fairly solitary.
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Can't argue with that.
I had some fairly hefty tugs on the bolt-rig last night on one rod, pulling the rig halfway across the river without a hook-up. 10 minutes after re-casting, the near-side rod went off with a hooked fish, about 4 1/2lbs.
I wouldn't mind betting it was the same one.
I feel it's the "smaller" chub that tend to do this (3 to 5lb bracket), with the bigger fish it's already hooked when you pick up the rod.