I used the Mash Calculator today to run a Hochkurz mash and ran into an issue I want to report. The masses and volumes will seem small - my current process is a very big partial mash, a bit of extract and a partial boil. Here was my planned mash schedule for 7.75# grain at 30°F (I had the grains in the freezer to keep them from staling - had to stall my brew day a couple of days): Rest 1: 145°, 30 mins. Strike temp 162°. Actual resulting temp 145° Rest 2: 158°, 40 mins. Calculator told me to use 4qt boiling water at 198° boiling point. Resulting temp 152° Rest 3 planned at 170° Instead I added about three quarts of boiling water (I'm estimating at this point) to bring the temp up to 160° and did not sparge. I'm curious as to why the first calculation was so dead-on and the second so far off? Don't know if it's a flaw or an error on my part. Cheers!