Originally Posted by zeekage
Hop utilization is affected by wort gravity and extract brewers generally do partial boils hence the increase in hops to compensate for decreased utilization due to higher boil gravity. If you do extract but a full boil you'd need to use the AG recipe hop schedule. In beersmith for the extract recipe set the equipment profile to use a 3-5 gallon pot and the IBUs will fall back in line.
Very good info... Yes, I was puzzled by the partial boil since I have been doing full boils. I also used the extract hop schedule with my full boil. That said, my IBU's must have actually been roughly as high as what BeerSmith calculated.
I guess it's a good thing that I'm adding hops to my AG version if I want it to be closer to the extract batch I made. From what you're telling me, I think I do need to add even more hops than what I have planed from this discussion...