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The part from your shoulders should be that little smaller than your helmet and shoulders in order to only fill the wake.
The next step would be to try and lower your position as much as possible.
Also if you could reduce rear track in order to have the wheels covered that would help aero but it probably is a compromise with handling.
I suggest more distance between front and rear.
Are there tight turns in your races ?
If not, a longer wheel-base should not be an issue.
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