I'm not sure if this is the best place to put this thread, but here it goes.
I had a super frustrating brew last night. I did an all zythos blend IPA and I could not get it to stop boiling over. As a result, I only got about 50% efficiency and missed my target OG by .016, and, with a 90 minute boil.
I should note that I do use a 7.5 gallon brew kettle, so boil overs are an issue for me, especially during hop additions. However, I can usually get it under control after 1 or 2. Last night, it continued for the entire 90 minute boil. And it was not just during hop additions either. It was the entire time. I tried everything: ice cubes, decreasing the heat, stirring, skimming the thicker foam with a slotted spoon.
I guess one question would be, are some grains more apt to boilover than others?