Tom A. wrote:

However, the main takeaway from those plots I get is that the deltas appear to stay consistent, rider or no, which I think answers your question above.

True, but the S3 and S5 have a very similar plot with no rider so that makes sense. The Felt AR does exceptionally well at high yaw angles with no rider onboard. I wonder how much that high yaw angle performance changes with the rider onboard? The more I think about it the whole body would create an area of high pressure on the side wind is blowing from which would create some lift. Here is a Flo Cycling blog post that explains the physics:

http://flocycling.blogspot.com/2011/05/flo-cycling-wind-tunnel-results-and.html