I think I may have figured it out actually (thanks to a small suggestion)!
Instead of using power (which is expensive) I used step. It gives a harder edge and does what I want it too. Input A seems to dictate how thick/thin the edges are. Also, the Smoothness Slider will affect the Edge. If you want it smoother, you need to adjust the Stepping as well. Cool!
The Slider is just there for testing. I use the Z channel from the UV Coordinates to make the effect work real-time with Custom Vertex Streams in Shuriken.
