To uninstall all you do is press the delete button on the documents. (only for the one with the long af name)
For the documents that add 50k starting cash: open it up and your app that you use should have a find button(ctrl+f) and look up 50000 and replace it with the standard starting: 8000. Also since it is the default setting you change it where it says default credits just change to 6000. Then change the starting tech level (look up 5 in the document find button) and change it to 1 (a failed part of the mod) now you have the default gameconstant document.