How much grain do you need for 23 lts brew.Beersmith says 3700g pale malt 1000g munich 300g crystal, to give estimated 1036 I got 1032 and OG of 1044.My post boil gravity reading was only 1036 but all volumes were pretty close to beersmith estimates so where to start to get efficency up

G'Day everybody i'm ben and i live in east ringwood vic.Did my first biab on saturday.Surprised at how easy it was ,didn't quite get the effiency I was looking for ,we will see how it tastes