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I haven't made and side handled teapots, but I suspect that this design is naturally drippy with that blunt of a pouring edge. At the risk of fragility, I would try to thin the lip out some more. It seems like it would be hard to build up enough force in the pouring stream by just rotating the wrist to start the pour. Speculating here, but it might require playing around with the pouring motion. I'm thinking more of a locked wrist and a confident lifting of the elbow.