I'll take a stab at it. The fly is so light and the float is so small the weight of the fly would not be heavy enough to pull the bait down through the bobber?
Might also have to do with the action of the bait which is created by "wiggling" the rod.
Seems like you could just put a slip shot a foot or so above the fly.
In any event I am displaying my ignorance here.
Sure would make things simpler gear wise.



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