Take a look at this http://www.luhrjensen.com/downloads/...31JetDiver.pdf
The rule of thumb is to achieve the depth of your Jet ie. 30 ft jet, run 100 ft of line out at 2mph to get your lure down 30 ft. The holes you are speaking of are meant to change angle I think.
Dave is right. Get the trolling bible. It is worth its weight in gold.
Let me know how you do.
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