Ok, another Q Mike... hoping you're able to help regarding some texture info here..
Here's an image of a texture I created within Unity...
The texture is tiled at 1024 x 1024, tiling set at 5.
I also created a Terrain Bump and set bumpiness at 0.015 (sharp). Now, whilst I've tried to ensure there is no shine on my terrain bump, anything higher than 0.3 does begin to have a reflectiveness, almost a circular shadow around myself as I move across the texture. However, as shown above, it isn't visible at this setting. It would be hard to illustrate as it's only seen during movement.
My question, is are you using a terrain bump in your current textures, what settings are you using, and how visually, does it transfer into the PG game - is it worth pursuing basicallly ?