yes hydro orientate is put round plug in water to find which end is up, sometimes wood rolls over because of tighter heavier grain and it makes a difference especially darters and swimmers. but you have to do it before sanding the slope.
I am not sure how you are going to get a unweighted plug to slow sink and suspend at a certain level. Birch is a great choice for unweighted darters. if you used ironwood to get it to sink, I would think it may not have action since it's so dense.
I don't mind at all adding lead to my plugs.
good luck
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