I need to figure out what is going on. I hit my numbers consistently with average gravity beers. But every time I attempt a big beer I miss my numbers - sometimes by a lot.
Today I brewed a RIS which was supposed to be 1.092 OG. I took a pre-boil gravity and it showed 10 points lower than predicted so I added all the DME I had (about 13 oz.). Even with that the OG is sitting at 1.077!
The grain crush was good. Brun'water predicted a pH of 5.5. My temperature held steady in the mash at ~155*. It was an hour mash. I planned a 90 minute mash but was running short on time so I kept it to an hour.
I'm at a loss. Any ideas?
The good news is that even when I miss my OG the beer still tastes good.