I'm scratching my head on this one. This is my first attempt using brewersfriend recipe tools and brew session tools. I was doing a 5G Heady Topper clone AG recipe from NB scaled down to 2.5G. I ended up with 0.5G more for my pre-boil volume and exceeded by pre-boil SG by 5 points. My post boil volume was 0.5G more than recipe predicted. I can't imagine not boiling off that additional 0.5G would cost me 22 points on my post boil gravity. I checked the reading 3 times on 3 different samples. I ended up boiling 2# of DME in 1L water to bring the post boil kettle OG closer to the target gravity. Got it up to 1.062 where recipe target was 1.068. By entering this new OG in the brew log brewersfriend is reporting reasonable brewery efficiency. What do I need to change in either my recipe or profile to adjust for this huge miss in OG? How should I account for adding the DME during my brew session to correct for the OG during my brew session in the brew log and/or my recipe? This turned out to be my longest brew day ever at 10 hours thanks to having to boil and chill the DME after I'd already chilled my kettle. As a BIAB brewer I've been using the biabacus Excel spreadsheet from http://www.biabrewer.info. I wanted to do a Heady Topper and biabacus didn't support the number of hop entries needed where brewersfriend did. I had biabacus dialed in with my equipment. Now I need to figure out how to dial in brewersfriend.