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Fraid you have it the wrong way round bar. I'd expect locking up to make the shifts less smooth not more smooth. I'm thinking locking up may be why yours feels jerky. Boxes that don't lock up and just float the torque converter are generally smoother.
That said, the jag box locks up as often and early as possible too, so if yours feels particularly bad, it may need a service, or it's fluid level checked
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