Blending was experimentally fun and scientific. So as we tried blue popsicles and blueberry Kool-Aid Jammers, we found the more intense aroma and blueberry came through ultimately on the Jammers sample at about 10ml/2oz (at 5mls/sample the popsicles were winning on both sweetness and aroma). So upon blending the keg today I went with roughly 8.8 packs and 2 ounces of the Madagascar vanilla extract that was left over from Orange Creamsicle. The sample on the left in the far right pic is final blending.
