Yeah, the Noise in f-Edge is good for very basic things, but to get something a little better, try nesting a Noise Map in a mix map
Mask - f-Edge with larger Radius
Map1 - Noise
Map2 f-Edge with small Radius
You can also use render to texture and generate image maps you can distort in PS or such. That is a way to get the edge effects after a Turbosmooth.