Interactive Foliage acting strange

AmbiguousPackage

I am setting up some plants to respond to player interaction. However the plants are not responding right. They seem to be ignoring the pivot placement and rocking from the center of the plant. Not the base where the pivot is.

This shader is based on the setup from the UDK's documentation.

AmbiguousPackage

Well after messing with it some more I figured out a fix for it. The circled are is what I added in, using the diamond gradient will a falloff and one minus I was able to get the outer leafs to shake. While the center remains more solid.