I understand that efficiency dropping in BIAB is normal, but I would imagine that Beersmith would take it into account when choosing a BIAB mash profile. Since switching to BIAB, my efficiency seems to drop every batch (last one was around 52%) and I can never get the right pre-boil volume (always too much) and batch size correct (always too little). I brew 11 litres batches and with the traditional sparge/mini-pipework set up, I always hit the numbers precisely and had an efficiency of around 75%. Although it works fine, I am having trouble hitting my target numbers and dialling in a reliable equipment profile.
I've been brewing on a Grainfather for about two years with great success and recently decided to switch to a BIAB, no-sparge method to save time and space (new baby, busy with work, etc).
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