I imagine Scooby has balanced the extra efficiency against the schrs handicap hit.
If he is smart then he would have done that. I remember him seeing that the aspect ratio is probably 5 and that is the way these boards look. But SCHRS handicap rating is not everything. There are downsides to using very long boards and I mean in the performance department. Such disadvantages may not be reflected in the calculated SCHRS number.
Wouter