I made my batch same as you did, 64 oz RealLemon, 10 lbs of sugar, and 5 1/2 gallons of water, 2 teaspoons tannin, yeast nutrient, and yeast energizer. I added another 32 oz bottle of RealLemon about 1/4 way through Fermentation. I don't think I have room enough in my carboy for 3 more bottles...