This is my first look at it.Thanks!
Someone showed it 'backwards' before.Not much value that way.
This is good,as at 22-seconds you can see the flow separation off the roof due to the steep contour.
At Cd 0.186 it's nothing to laugh at,but Kamm would have said to relax the roofline,gain some interior volume,then chop it off like a loaf of bread at the same length.
Here's the other shot.You can see how the smoke is not following the roof.
Here the Volkhart Sagitta is doing the same thing,separating right where the tangent angle has hit 22-degrees
Here,Kamm/Fachsenfeld have relaxed the pseudo-Jaray contour,going full-'Template' for lowest drag.(This FKFS model has no edge radii,nor tumblehome,critical to a fastbacks top performance),so we have to settle for Cd 0.21).
Here,the 'Template' anticipates unstable aft-body flow
http://www.prototyp-hamburg.de/newsl.../Windkanal.jpg