I've got a batch from a week and a half back that seems to be settling rather slowly, so I've taken a 75ml sample and added 0.5ml Acetone (0.66%)
I'll compare this for soap with the rest of the batch later this week.
I'm also about to make a new batch tomorrow, I was going to take 2x 500ml samples in the same jars, one with and one without acetone to compare settling of those. What percentage do you think I should try?