It looks like the air is making the 'jump' really well across the locked-vortex between Kamm rear edge and beginning of down-slope on the box.
The flat top area of box is the only area with reversed flow,indicative of the vortex swirling in towards the backlight.All good!
Hucho prefers long,shallow -angled diffusers.I suspect that the tufts underneath are kinda telling on that.
With concessions to driveway clearance and such we'll have to be 'practical' in this department.
Thanks for the pics and videos!Nice project evolution.
