Karamba - Force Flow on Shells/Surfaces

Hey,

I want to analyze the force flow on my surface. If I take the exapmle of the TUTORIAL:

KARAMBA-ShellCantilever (see attached) my result is a number of Force-Flow-Lines on the Shell. Now I would like to analyze where is the highest force-flow to chage the profile of my beams. 

For that I thought about two appochches:

1. analyze the colour, and pick out the areas where the colour of the shell viewer is the strogest one

2. analyze the distance beween the Force-Flow-Lines in order to find out where is the highest density.

Any other ideas or suggestions how to analyze the force flow on surfaces?

Thanks for your help!