ive never use peaks pnk sugar(and i love peaks fos), have you used that recipe before? maybe the soybean oil? the bubbly is very low, cleansing low. I think soybean oil is prone to getting rancid? can i rec a recipe? do you have palm oil? Even coc, oo, shortening, castor would make a good soap.
pink sugar is known for discoloring becuase of the vanilla
sorry, maybe it will bounce back?