@Rik: would be - I think - a good option to have a 16 KM environment. 8 and 16K environments are better for low end PCs; I believe this could be a solution for CTDs due to high use of hardware with the 20K enviro and your night attack project.
Only a suggestion...
In my PC the 20K enviro works well, without CTDs in both NYGM and OneAlex. Only condition in OneAlex is do not use the Merchant Fleet packs by Kyle.
Best regards.
Fitzcarraldo