Hello,
When creating Materials for R5, I tend to prefer using the Standard Mode instead of the Slate Mode.
One issue I notice right away is how you applied the Rim lighting. Here are two images on how you apply it.
Here is the Standard Version
https://www.dropbox.com/s/bohgkro8u6...m%20Radial.jpg
Here is the Slate Version
https://www.dropbox.com/s/yhswi3gybd...20Radial02.jpg
You need to apply a Composite to the Self Illumination slot, name the layer [Rim Radial] and then apply the bitmap. This and the rest of the details are shown in the images.
I'm not sure about how the diffuse and reflection maps are applied. Could I get a hold of the assets and see how everything's applied?