However you weight it, I'd keep it floating at an angle. I built something similar a few years ago that was heavily tail weighted (and convex shaped/central line tie) and floated straight up and down with the nose out about 2". It sucked. Did more porpoiseing than anything else on retrieve. I think that sort of weighting scheme works better with narrower profile plugs. I also think the profile of the back half of the plug becomes important when you weight it. For plugs that float at an angle I like convex (hump of curve out), for plugs that float straight up and down I like straight or concave (curve in). I think as you pull the plug, the shape of the back portion briefly acts like a rudder/planer. With the heavier tail you want it to push the nose down, with the lighter tail push the nose up. I definitely like the lower line tie on plugs that float at an angle. I haven't tried them on plugs that float vertical, but I suspect it wouldn't work as well.
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