I need a C# and Grasshopper expert to solve a small issue within my script -- 2

I am scripting a particle spring system based on curves, when I play the particle system, the result I get is fine but needs a tiny fine turning, the edges of the particle spring is clamped, I want to make it so some of the points on the edge are not clamped, check out the images to see what the problem looks like.

I need to not make some of the points as anchors in order to make a more realistic web.