I don't think you want your needles to suspend/sink level (unless you shape the nose asymmetrically to provide lift/or intend to dead drift them) . The ability to control depth of retrieve comes from the planing action of the body. The action of a needle (i.e., those that swim) comes from the shape of the first 2" and angle at which that shape moves through the water (think of a tin squid and you'll see what is happening). The speed you need to retrieve them is a function of the lift provided by the body angle/length, and the total weight of the plug.
As complicated as this sounds, in my experience it doesn't matter much..............fish seem to like needles no matter how they swim or sink and I think the profile and movement is way more important than all the other stuff.
Glad to see you back at it, John.
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