What I am curious about is would one notice a difference between a beer brewed at 27 ibu's, vs the same beer brewed at 23 ibu's?
If I make a recipe that calls for .75 oz @ 60 min and .4 oz @ 30 min. to hit my desired ibu's, would one be able to taste it if I used 1 oz @ 60 min, and .5 oz @ 30?
Along the same lines at what %AA difference would one start adjust the hop additions?
I assume it would depend somewhat on the beer style.