This is interesting. I have done 2 brews on the foundry, 1st a no sparge, mill gap at .035 and ended with 58% efficiency. Second was a big beer and adjusted down to a 4gal to it'd fit, mill gap at .025, 1.5qt/lb, sparged with 1.5gal. Got 65%.
It sounds like I'm recirculating too fast, I...