A problem I’ve been grappling with for a long time with UE4’s physics is spinning cylinders. Anything with a long, cylindrical collision shape has the issue where if it gets spinning around it’s longitudinal axis, it’s stabilized in an odd way similar to how a faltering top wobbles before it falls over, except to a much greater degree than is realistic. Here’s a video of what I mean:
https://www.youtube.com/watch?v=Plbfkv5UhiE
I’ve tried tweaking several physics settings, using physical materials, applying dynamic damping in blueprints, every permutation of CCD, substepping, stabilization, and everything else I can think of, but nothing stops this behavior.