A rookie mistake when working with Extruded Text and deformed geometry is just to perform a standard Extruded Text Object without regard to the shape of the geometry you may be pairing the Extruded Text with. The result is uneven extruded text that doesn't look stamped or molded to the geometry.
The way to properly set up your splines is to Project them onto the geometry so they take the shape of that geometry before you perform an Extrude either with the Extrude Text Object or performing an Extrude Function.
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