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@svenhöek
random thoughts:
There were some anecdotes/basic tests/internet wisdom(disclaimer!) that at bike speeds your chosen tubes will be less draggy with the thin end forward.(mimicking the front end of a longer airfoil)
also if the headtube is airfoil-shaped then go for more tube / less spacers. If the headtube is round make it as short as possible and use a positive rise stem (which becomes a very long oval shape to the wind)?