The reason the whole mesh appears green is because you are using Alpha blend as your "top" blend layer, and alpha always defaults to a value of one, so it will always pick the highest option, which in this case is green.
Tomorrow I am going to see if I can't clamp the colour gradiation some how. I am not using texture maps so its not a 'texture blend' which I could just apply a blend mask to. Virtuosic (Ryan Smith) recommended I look at Multiply and Clamp to achieve that. Edit: I can do the top blend, thats default. I'm going to see if I…