I brewed a partial mash IPA kit recently. The boil size was about 3.5 gallons. I plugged the recipe into ibrewmaster and the IBUs came out to about 43, which seemed low for an IPA. I changed the boil size to 6.5 gallons and the IBUs went up to 73, which I expected due to better hop utilization. The question I have is if I actually went to a 6.5 gallon boil would it be watered down since the grain bill and extract amount was formulated for a smaller boil? You have to add water after the boil anyway so I didn't know if it mattered.