Question Vfx graph custom shader

Hello I am working on a shader based around this tutorial

, I adjusted it so far for working for a vfx graph shader but I want to make a version that works as a trail. The one I created does not seem to stretch or do the size over lifetime of the custom shader properly. Am I missing some special nodes or something for my vfx graph shader so that it stretches properly and have that proper shrinking at the tail of the trail with the size over lifetime.