I was just going over some of my earlier recipes and found one I got from a book (before I knew about soapcalc etc). I was surprised to see I only used about 2 oz for an 8# batch due to the recipe instructions. I do have a note that I wanted to make the scent a bit stronger next time but it wasn't (and still isn't) bad as is. I now lean toward .75 to 1 oz PPO depending on the scent and the process used.
I also ran that recipe through soapcalc and was shocked to see it had a 14% Superfat!!
Still one of my favorite soaps but I have not made that recipe again.