For what it's worth I think the ultimate proof of the warpspeed RC increase is the track. The benefits of the warpspeed setup may outweigh the RC/ride height deal. For asphalt rubber tire this wouldn't be such a big issue as carpet I think because on foam/carpet you have so much more grip. I mean just look at all the rear toe conversation. That's important because the tires aren't slipping on the carpet so removing toe really frees the car up. The ackerman angle seems to have a big effect too; same reason-low tire slip. What else comes with this? traction rolling and dragging the chassis edges and ride height becomes very important; most carpet tracks will check minimum ride height too. So you can see how the .4 mm impacts the setup pretty directly, and small changes are more noticeable because of the grip levels....and those old RS4 roll center plates were designed for rubber tires on asphalt.