Not enough headspace for 2nd wort

[beerisyummy]

Hi there, I've just started my annual spiced ale for Xmas. All-grain, BIAB. I usually like to add a 2nd wort of boiled & cooled Lyle's Black Treacle and a little extra DME, at or near high krausen - has worked nicely the last couple times.

howEVer...

I grossly miscalculated and ended up with too much wort in the carboy - almost 6 gal, plus maybe a liter of starter. I don't know how I could have made that mistake! Well, actually, yes I do I mean, it's good to have lots of beer, but it wasn't my plan exactly.

So what would you do next? (1) Just do it, and lose a quart or two in the blow-off, or (2) let it ferment out & settle, rack to secondary, the idea being the trub left behind in primary (I got a lot already for some reason) will then give me more headspace in the 2ndary.

Many thanks for your opinings.

 

[McKnuckle]

I would find another small fermenter, maybe a gallon or whatever makes sense, and siphon off the excess into it. Ferment that separately and bottle it. Then you can proceed as planned with the main batch.

 

[Calder]

Add it to secondary. There will be plenty of yeast, the re-fermentation will create CO2 in the fermenter, and you will not get as much fermentation activity to lose beer. A benefit; since the fermentation will be more subdued, you may retain more of the treacle flavor.