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For your experiment, I'd just pitch the 3278 and see if you like the results. It may take many months to develop the sour profile that suits you....
Just get started and don't worry so much. I do 3.5 gallon batches on my electric stove in my kitchen. I could probably do 4 gal. batches but my...
79% efficiency is really good. Are you happy with way the beer is coming out? I'd just accept that 79% and add more grain if you want more alcohol.
Beer prices have been going up because the customers are willing to pay. If its not worth $23, don't buy it. If the brewery can't sell it at that...