Steve, not sure what your "glass_fresnel_red.dds" looks like.
Is it a solid shade, or is it from right to left, a gradient from black to white.
For reflectivity to change, you can shift that gradient (left or right) or find a common mid-color in that gradient that allows the degree of reflectivity you want. Be aware that it will also slightly affect specular and diffuse, but that may be what you want.
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