Well, I was getting ready to post the question about sour cream, so you beat me to the punch. When adding the yoguart, do you discount your water by the amount of yoguart you are going to use and do you put it in after you have traced the soap to a light trace or what?
let's say i need 20 oz of liquids- i usually go a little more than half-say 12 to 14 oz of aloe juice or water, tea, etc... to the lye. i chill this before i mix in room temp oils....i usually add 1 oz glycerine and 1 tbsp honey to any combination of milk/yogurt or coconut milk so it all totals 20 oz COMBINED. smake sure it is well mixed! so far it has worked perfectly- which keeps me out there trying to press my luck even further!
my next batch i'm going to used condensed milk, honey and lemon yogurt to my lemon-poppyseed soap!