Hi there, I have a Brewzilla and I think I am getting bitterness from sparging with to much water and extracting tannins. I am getting quite good numbers over all but always to bitter. Is there a simple rule of thumb for sparge volume and grain weight or mash volume without setting up the calculators in Brewfather. I am mashing in 23lts of water with around 5kg grain and sparging with 15lts water at 75C. I am getting good efficiency of 75- 80% not doing PH. No infections.