So since I started playing I have been able to use the following save editor (https://www.saveeditonline.com/) to modify slave stats like grade, height, beauty, and even traits to some extent, but now it seems that this tool cannot handle even a fresh save file for more than a second or two without freezing. 

I know there are in-game methods for changing things like the grade and height of a slave, but I found it to be a general pain sometimes with the magic toxicity of potions or the wait time. I also didn't like the fact that that my favorite slaves with favor traits  are considered by the game to be unalterably fugly outside of temporal beauty pots and kimono.

 It may be an impertinent question, but does anyone know of an alternative program, site, or tool that would help reasonably view/edit the save files? I know it can be opened in notepad++, but I can't discern a thing in that jumbled mess like that and don't know if it can be edited.