Are you trying to modify a standalone or dependent mod created via the editor?
I am using the 4 CC mod which you created.
Edit- Wow you helped me again SniperHF. After your post, I realized that there are stats folders inside public/*modname* folders as well. I needed to put the file in the stats folder of that folder. I wasted a lot of time in editing constitution and act part, but now after putting it in the correct folder, I realize that changing only "vitality" does the trick. Thanks a lot man.