Thank you very much for the file.
The section that you indicated as a problem could be "supported" in several ways; three options are attached.
Forcefield, moving "Repel" (Attractor), and roughly aligned Gravity with a spline Field.
Examples
https://projectfiles.maxon.net/Cineversity_Forum_Support/2026_PROJECTS_DRS/20260103_CV4_2026_drs_26_SIgy-rp-rb_01.zip
Would that work for you?
Cheers