Pic related is what I used for my spooky games. It works well. Sort of. The sanity points are fine, the health points (when combined with the occasional incurable damage) is good.
But I really don't like the skill rolls. I hate success/failure binaries, so I always house rule it to have degrees of failure and success. But even so you always end up with these bizarre characters with 80 points in library use, making them basically 'decent' at research, and half of the things that a normal human being would be able to do like take pictures of things, drive a car, walk down the goddamn street.
I really like the 'degree' system in things like paranoia, or mutants and masterminds. And while house-ruling 'works', I'm wondering, is there a system that already has this stuff built in? I skimmed a few other versions of Call of Cthulhu but I did not really find any that solved this for me, or at least not without introducing worse problems. Am I looking in the wrong place? Any advice?
Try Classic Unisystem (Witchcraft, All Flesh Must Be Eaten).
Comes with a degrees of success mechanic (and commonly people houserule rolls totalling 5 or less to be dramatic failures worse than regular failures). Humans are squishy and gunfights are bad, bad ideas.
Madness system can be found in One of the Living splatbook, but comes with rules for Essence (magic/mental stamina) and half-decent fear rules.