I almost always steep hops when I brew and I read somewhere how different oils in the hops that lend to aroma and flavor can still be depleted in higher temperature worts e.g. directly after flameout. The first time that I steeped hops the recipe contained 100% cascade and from the article I read (and can no longer find) I was informed that the dominant oil in that particular hop can be depleted in temps over or around 150-160F. I normally cool my wort down to 160F before I add my steeping addition and while I am not a long seasoned brewer I can tell a huge difference over only flameout additions.
I am curious if anyone else has practiced this (or other) steeping techniques or can lead me to an article/forum with an in depth approach to steeping hops. All I normally find do not contain methods of slightly cooling wort before adding hops.
I am also curious about re-figuring my IBU contribution with the cooler steeping technique as I would imagine I am not adding as much bitterness as calculated by my brewing software.