I've been trying to use Brewers Friend software my past couple brews, and today purchased it. Trying to figure out how to dial in my system. Obviously I enter the grains, hops, and amounts I used. When my actual gravity readings don't match what they should be, should I adjust my efficiency number? Not quite sure what I should be changing or how to get a recipe from here to work. Maybe I'm just being OCD at this point, but I'd like to get it to where I can hit the predicted numbers.