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You might find them to roll less if you place the line tie dead center and the lip just above center. Also, the lefty lip will give a little roll to a plug. You could grind the edges of the lip so that the sides are straight out from the plug (i.e., no curve to the lip).
I do some freshie swimmers in a similar size, no weight, colorado blade for a lip (bend it down straight like a surfster lip). Swims real nice and the smallies eat it up. Might be something else to try.
Jigman