Hi Paul,
If Jonas had his laptop with him that day, I assume he worked on an M1 Max MBP. I have tried to reproduce it on the same model and also checked different releases. Somehow I run into the same problems as I believe you do.
Please set up everything as he does (Leave Gravity as is for now), but try to increase the Sphere Field; that did the trick here.
Here is my "follow along" file; while having also explored all options, I assume that Sphere Field adjustment is the way to go.
CV4_2023_drs_23_SIch_11.c4d
Image has SDS on it (default settings)
Jonas_Energy_Vortex_Cloth.jpg
If your problem is not solved, please share your file here. I'm happy to look into it, and if needed, ask Jonas directly next week.
I found to rotate the Torus a little bit (R.H, animated) allows for better folding.
My best wishes