Substances like Oxygen have stack size of 9999. Salvaged Data and the like have a stack size of 5000, and so much more.
I have modified these files:
NMS_REALITY_GCPRODUCTTABLE.EXML
NMS_REALITY_GCSUBSTANCETABLE.EXML
Mods that use these files will not be compatible.
Credits:
xXMrs_FreaKXx