drawdy10 said:I wouldn't adjust with the dark sugar, DME if needed would be your best bet but if you are planning on missing the OG then maybe try lowering the efficiency on your recipe and use more grain or sparge more and boil longer to concentrate the wort before starting the hop schedule.
Still dialing in my efficiency on my new all grain system. The last three brews have had sporadic efficiency at best. Just trying to see what would be my best bet for a correction