I've gotten a few lessons on the bank by some guys fishing beads, and I've seen quite a few approaches, so I've been trying them all to give as many options to the fish as I can. Sometimes it's letting it do its own thing at the end of a 24" or so leader after my main 1/2 oz sinker under a 1/2 oz bobber, trying to keep my sinker 6" or so off the bottom. Then there is the long leader 3-5' length with a couple, to a few BB splitshot spaced evenly down the leader. I've been trying single beads, double beads, single bead with yarn, small yarnies, corkies, corkies with yarn, etc. I have fought a few fish with these different setups, so they do work, and the guys I was getting schooled by were catching fish.
I'm not sure how the bobber dogging setup is rigged, but wouldn't your main sinker be the thing bouncing along the bottom, or do you weight the leader in such a way that the bead is forced to the bottom?