Balloon rope keeps stretching

[assumption-fortune]

I'm trying to follow the tutorial below with rope dynamics but my spline keeps streaching no matter what I do.

tutorial:
https://youtu.be/6_1XPVZzCPQ?si=l7wp1lI38zvebEVE

Here is scene file:
https://we.tl/t-7A4oX1lR2u

[Dr. Sassi]

Hi assumption-fortune,

Thanks for the file and for using Wetransfer.

Going by the file, you like to have four letters moving like balloons.
Perhaps this is the fastest way.

https://projectfiles.maxon.net/Cineversity_Forum_Support/2024_PROJECTS_DRS/20241229_CV4_2025_drs_24_SIby_01.c4d.zip

I used the Thicken object to have the blow-up effect.

Cheers