Well, it didn't accelerate on me. I used a 40% lye concentration and soaped at room temp, for reference.
I also decided to make a charcoal soap with pumice for this one.
I believe this FO discolors, but because of the charcoal, it's really hard to say for sure. The top of my loaf was tinted yellowish, but not the rest of the loaf, so I chose to cut off the top and it seems fine.
I thought I remembered the basic usage rate was 1oz FO PPO, so that's 6% and that's what I used. I can literally taste the fragrance via smell! I am clearly much more sensitive to smells than DH, though, because he said he can only smell the soap when he literally holds it up to his nose!