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I don't stress too much about numbers. General rule of thumb 4kg base malt = 4% abv 5kg = 5 % and so on. That's for an ale yeast. I am currently brewing a pale ale. The original gravity is what it is.Hi, looking at your figures using bag-in-Burco brewing, that efficiency is quite low.
Do you simple drain the mash bag and not rinse or sparge it at all?
It doesn't have to be sophisticated, just a few litres of held-back cooled off boiled water would easily give more gravity from that bag for you.
Or am I trying to teach you how to suck eggs?Sorry for butting in, if so.