Let's say you had an IPA brewed with 2.5 oz Amarillo(8.5%) for 60 mins and finished with 2 oz Cascade (3.9%) for 10 mins. This makes the bitterness ~75 IBU and I would have .5 oz of the Amarillo left over. Would you prefer the brewer to have used all 3 oz of the Amarillo (total IBU ~88) or save the left over Amarillo for dry hopping to add flavor/aroma? Thanks.
Btw, while we're on the subject. If all the parameters of my beer meet the style guidelines for English IPA except IBU (40-60 for the style, 75 for mine), would that make it qualify as a double IPA, or are there other factors that distinguish a double IPA from a normal IPA?