I'll take a stab at this, the pikies get weight under the chin because basically your line enters the water at an angle and the force wants to make the plug come up too much so adding a little chim weight it keeps the lip down in the water so the plug can do it's thing which is waggle with it's nose down and rear up.
The danny wants more of a snakeing motion so with the weight placed at more of a pivot point in the middle , that does the job for you since dannys ride more or less on the level.
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