Yeah, I agree. He might have actually said final gravity referring to the final gravity of the boil... but I don't know. It's been a while since I've read that part. I think either it's a miss print or he seriously needs to reconsider his word choices, considering how specific they can be for homebrewers.
Also, for my barley wine I used 5 percent caramel/crystal, because in a beer half it's gravity the same amount represents 10% of the fermentables. I believe it can be easy to use too much. For instance:
Say you were making an imperial stout by merely doubling a recipe you have. Say the original recipe calls for 1 lb of roasted barley. That means your imperial stout, for the same volume of beer, will contain 2 lbs of roasted barley. To me that seems like too much, even though technically speaking it's the same percentage of fermentables. I don't feel like flavors in beer increase linearly with the addition of malts.
Just food for thought!
Regarding your notes on the size of the operation, how do you think it would be affected if I split everything into 2 equal smaller mashes/ boils and then add everything together once it all is boiled down enough to fit into 1 pot?
If you have the ability to make two separate batches of beer and combine them after the fact, that's not a bad idea. You would need to run the equivalent amount of water through each mash tun as if you were making a full volume beer...
IF you are trying to reach your standard efficiency. This means a longer boil time to get rid of that water.
And here we go: the ol' hot-side aeration bit. I don't intend to start a HSA debate here, but I have strong personal evidence of it, so I take precautions to avoid it.
If you're not familiar with it, it's the idea that oxidation of beer happens faster at high temperatures. This scenario usually occurs during the transferring of hot wort.
I'm not sure how you can combine two volumes of boiling water into the same pot without turbulent mixture. I suppose a silicon hose for a siphon (careful not to scald yourself getting it started) or if you already have a valve on your pots, you could use the silicon tubing with that.
You begin to see why I chose to do partial mash...