Repulsion Points

Hi everyone,
i'm trying to use this definition to make a simulation of fibers bundling. I would like to add a power law into the Kangaroo component to move all the fibers outside the space between the 2 mesh faces.
I tried to add a part of the script (the one that you can find in the .jpg attached file), but it doesn't work correctly.
Thanks in advance to everyone who will be able to help me!

Filippo