I get some strips of poster board and fix it to my mold with spring clamps. I tilt the entire thing on my radius dish to get my desired taper (even to do a slight "Manzer wedge") then use a thin Sharpie on a compass to scribe onto the poster board. I then remove the poster board, cut the line and trace the profile onto some scrap plywood. From there I have a template I use to either mark and bandsaw, or router off, that I can use every time. Takes only a minute or so with a radius block afterwards to touch up and it's very repeatable.
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