I weigh my oils and fragrances for bath bombs and usually add a bit more oil. Especially if I'm using Polysorbate 80. I go with 3 cups Baking Soda and 1.5 cups citric acid, 2 oz of oils (usually Shea and coconut and hemp seed to get to the 2oz total), 1 oz polysorbate, and whatever FO or EO. I...