60 min mash or 90 min? What is your target temp? Other than that, the recipe looks fine.
Split batch is 2x the boil off correct?
Let's see, you want 6 gallons into fermentors, 2 gallons boiloff (seems like quite a lot to me), 1 gallon for grain absorption, and about another gallon for trub. For BIAB, no tun deadspace.
I get 9, which sounds more reasonable than 11.05.
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