Not scientifically, but yeah I did. In my old cooler setup I was using 11lbs of grain getting an OG of 1.055 or thereabouts. With the robobrew, I typically hit an OG of 1.050-1.054 with 12lbs of grain, so I adjusted my recipe up to 12lbs of grain but got OGs of 1.040-1.044 for the Hefeweizen