Added another gallon this time (2nd partial mash experiment), and got 5 gallons of 1.072! Adding another gallon to the fermenter to bring it down to 1.60. At 60% efficiency, brewgr told me I'd hit 1.055. For 1.072 brewgr tells me I'd need 94%? Seems impossible.
Salts CaSO4 1.0g, CaCl 0.6g. Mash low.
warm brewed pandemic pilsner