Four gallon Amber ale on Saturday. Still dialing in my SVBS. Pre-boil gravity came in low despite steady mash temp @152. Pre-boil volume @ 6.5 gallon. Finished with 4 gallon @ 1.053, rather than predicted 5 gallon @ 1.059. I'm thinking tweaks needed to more grain and less water, increasing flow rate in recirculation, and reducing boil intensity from 95% to 80-85%. Nevertheless, fermentation is proceeding nicely @ 1.031 today. Also, noteworthy the refractometer and tilt readings were in agreement @ 1.053/4 given my eyes ability to resolve the little lines. Every brew is an experiment and an effort to reach the null hypothesis.