Steve, on some of the deep lakes with bigger fish up here I am advised that this technique is deadly at times. I think its just about that time now when the fish are not shallow for the wag to work but they are not nailed on the deck
either.It might be caused by the way the water warms up and warm layers exist I dont know. I do know from my experience that lots of carp are caught off deck even in winter.
I read an article some time ago from a Hayfield regular John Howard who used it on the bomb, I think he scalded punched meat then froze it, after thawing the meat floats.
I guess its like any other method on hard fished commies, its just something the fish dont see too often that can score.