Low Volume; weird results

What were the couple of factors you forgot to take into account?

Based on the limited facts presented, my guess is that you didn't use enough water in your mash/sparge, which contributed to a low mash efficiency (though given the numbers, the efficiency was probably going to be low anyway). You would expect higher bitterness in this lower volume, because you have more alpha acids isomerized and utilized per gallon....but judging bitterness before fermentation and carbonation are done can be misleading.

Is there really a problem to fix?

 

If you wanted to you could whip up some LME or DME and add it to your primary. I'd heat it and cool it first and just dump it in.

As for what went wrong, I'd start pointing a finger at low efficiency. Crush, sparge water volume, temp, pH etc.

As fuhrer VikeMan has suggested, sometimes fixing the problem will only cause more problems. Being a little high or low on IBUs or Gravity isn't the end of the world for a session beer. If you were going to enter this into a competition, you'd have DME on hand, and you'd be willing to rebrew to meet your needs more specifically.

Consider rounding out your hop flavor with MORE hops. Dry hop with something nice and you won't taste the bitterness as much.

 

You did not mention Grain bill, hop bill, or mash temp. etc.

Don't forget 22% of initial volume can be absorbed by the grain. Example: start mash with 20# of grain, the grain will absorb ~ 20#*0.22 = ~4.4 G lost to grain absorption, then there are other losses, system losses, temp shrinkage, boil losses, etc.

 

"In a rush."

I would say that nine times out of ten, when somebody posts here about a batch that went disasteriously wrong, those three words figure prominently in their description of the process. Just sayin.

 

I think it would be useful for us to know what was your recipe and procedure in order to understand why you ended up with less wort qty. and less OG wort.In a naked eye it seems like there was an efficiency problem but it is not for sure because we don´t know the grain bill you have used.

 

Since your gravity is fairly close to what you planned and under your target, I suspect most of your "lost volume" happened on during the transfer to the fermenter. You might have underestimated boil kettle's dead space, underestimated losses due to hop absorption, underestimated your transfer loss to the fermenter, or some sort of combo of those possibilities.

Now if your preboil gravity was way lower than anticipated, I'd then gues that you underestimated your boil off rate and that the extra boil off helped to get your gravity closer to your original target while lessening your overall volume.