I use BeerSmith to help me calculate amounts of hops for bitterness according to style, but I want to try skipping the bittering (early) hop additions altogether in favor of more late additions. The problem is, BeerSmith says that you get 0 bitterness from hop additions at flameout, but I don't really think that's true. If I toss in an ounce of 7.9% Saaz at flameout, and then open the valve to drain the wort through a CFC, it'll be a good 10 minutes before the wort is entirely drained. (Gravity)
So how do I calculate the bitterness here? Do I add 10 minutes to the calculations for bitterness for each hop addition, so that something added at 5 acts like something added at 15?
Pretty sure if I added 1 LB of Citra at flameout, it wouldn't have zero IBUs.