I found this dude. He's taken analysis of CYOA to a whooooole new level.
His tree graphs of the choices look just like my first attempt at a non-spoiler numerical index. And he also confirmed my belief and practice of making happy endings rarer than mediocre/unhappy finishes. Interestingly, he is able to somehow calculate how common a choice was, and confirmed that the most likely of choices lead mostly to crappy endings, and the happiest endings are actually harder to find because they are uncommon choices. That is an aspect I never considered when I created my choices, because I wanted to make my choices (significantly fewer than in an old cyoa) ALL be reasonable.