baking two different colors in same surfaces

Hi people!! 

I have a doubt about rendering two different parameters of colors. The first of them change the color of all surfaces according to a numeric variation from (0 to 1). The second changes the color of the same surfaces but according to the height of surfaces: they became more black if they are higher.

My intention is to turn the first more darker, so I think the second has to be outside when I bake it, or is there a way that I can define this into GH not in Rhino?

Another problem is that the transparent surfaces become gray when I render them.=/

I posted the file !!!