Will do. Renaming rwgmixer.xml to rwgmixerOLD.xml and putting my own with generation_distance="10000" set to generation_distance="3000"
and at the bottom setting
<biome_spawn_rule name="burnt_forest">
<distance_from_center range="2000,3000" />
</biome_spawn_rule>
<biome_spawn_rule name="radiated">
<distance_from_center range="3000,6000" />
Let ya know how it goes. In theory should be double the size of Nav. With the rad biome on the outside.