Again - size matters here. Not just in kg, but in your frontal area (CdA) as well. When things get spicy, 300w probably buys me more speed than most racers. I've never had my road or TT positions formally tested, but this has been a suspicion of mine for more than a few years. Of course that doesn't (really) apply in Zwift.
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"Your beauty is an aeroplane;
so high, my heart cannot bear the strain." -A.C. Jobim, Triste