Post 3195 by myself quoting a scale model site...........regarding to the Pillbug.
https://ecomodder.com/forum/showthre...tml#post607916
And Aerohead again suggested a tail fin would have probably resolved the issue.
Now I have to remember the drag vortex quotation source. Something like relieving these forces, other forces become more apparent.
On my own vehicles, aero improvements increased stability, most notably in crosswinds.