I want to make a sour stout, but I have some questions about the hops. First off I was going to use aged hops, but I started reading about it and ran into articles saying that lambics are really the only sour beers with aged hops. Therefore I will be using unaged hops useless I'm incorrect. I was wondering if I should keep my IBU level lower than the average stout? As far as AA% levels go should I stay with lower AA% hops or does it really matter? If I remember correctly my regular stout recipe was in the higher 40's IBU range useing Magnum and Mt. Hood.