I mostly use PreviewLW (Custom Preview Lineweights) from Human to make this work. I’ve used it in Rendered, Artic, and Raytraced mode before, and works like a charm.
Otherwise, you’d have to tweak your display settings in the Rhino settings - I guess -, which wouldn’t really be parametrically controllable, unless you come up with some kind of script to do it from Grasshopper.
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