How are brewers these days calculating whirlpool additions? I typically add mine around 150-160f. The ibu's calculated seem high to me in Brewers Friend. I'm just kind of curious because I've always considered flame out hops at 0 minutes of the boil. No ibu's are calculated for that addition. I guess I'm confused as to why an even later addition at or below 180f would calculate higher? Have I been figuring wrong for the past several years using BF? Also, just noticed that .5 oz of cascade added at 5 minutes left on boil calculates less ibu than a .5 oz whirlpool addition at 150f.