Lightmap Optimization Question

Teaspoon

Hi,
I have been trying to create a lightmap for a VR environment but there are certain roadblocks that I couldn't search and find answers for. 
I'm baking lightmaps, using Unity's Enlighten and lightmap UV tools. After the bake, resulting map doesn't utilize the whole UV space that I have specified. As you can see in the attached image, all clusters populate near (0,0). What settings can I use to reduce or eliminate this waste?

Resulting Lightmap:
Mapping Settings:

Eric Chadwick

The two "texels per unit" fields will increase the size of the UVs in the lightmap. Adjust and rebake until it's as close as possible. I suggest reducing the quality until you get the right texel size.