Just did and imperial black IPA(1.078-1.012) with hop additions:
90 min boil
FWH 1.5 oz. Chinook 11%
60 min. 1.5 oz. Chinook
5 min. 0.5 oz. Chinook, 1 oz. Cascade 4.8%
0 min. 0.5 oz. Chinook, 1 oz. Cascade
Dry 1oz. Cascade, 1 oz. Kent Goldings
With the amount of Chinook the bitterness does seem...