I also suggest you go into HardcorePlayer and add: data "Vitality" "100"
Check your Vitality before, then do this whole step above, run the game and check vitality after, it should be noticeably higher. This is to make sure this mod has kicked and you done it right. Then when it is working, exit, remove the Players Vitality 100 and play the game with adjusted NPC stats.
Did that, Sabille health went from 30 hp to 60.
So its working. Im playing classic with Lohse and Tactician with Sebille, separate profiles. Will compare the situation through the intro and Fort Joy.