I'm not an engineer nor do I play one in real or any make believe life. The air after hitting the front of a softride is able to reform into smoother layers than a double diamond frame. You get smoother air hitting your back wheel w/ the softride vs the frame downtube churning the air. I would argue that the softride would be a faster frame than the standard double diamond frame no matter what back wheel you toss on.

edit: I don't think the frame, no matter what it's style, makes as much difference as rider position.

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Brian Stover USAT LII
Accelerate3 Coaching
Insta