I finally tried this one today. I cut all the ingredients in half as I was doing a 2.5g batch. Wow.. was I off on my OG by a TON. I did this as a BIAB.. only my 2nd BIAB brew. I preheated the MT with 160* water and mashed in the 4.5# of grain with 165* adjusted water. Couldn't believe it.. Temp dropped to 145*.. So I pulled some weak wort and heated to 170*. I did this twice and got it to 154*. However, after 1 hour of mashing with 6.75 qts of water and sparging with 168* water and going thru my 1 hour boil, I only came up with a gravity of 1.032. This is the worst I've ever done.. by far. Worse yet, I cooled the wort before checking. So, I put it back into the BK and added enough DME to bring it up to 1.055.. just short of Yoopers OG. Part of my issue was I had FAR less boil off than I usually do. Change in BK and possibly not as vigorous a boil as usual. It's now in the fermenter. We'll see how it turns out.
Next time, I'm going to check my numbers the BIAB calculator before progressing. I only lost 3/4gal in this boil and usually have double that... argghhh. Nothing like a change in process.
The first time I did a BIAB, I used the calculator at BIAB and it came out perfect. Have NO idea why this one didn't . This made for a L O N G brew day.