FWIW, this past weekend I bottled a 1.082 O.G. Citra/Amarillo/Cascade IPA.
For my own taste, I like to overload the flavor/aroma with American hops and don't care about the bitterness so much, so I go with later additions.
I went with .5 oz. of each at each addition - 40 min, 20 min, then...