I like to do my APA’s and IPAs by “layering” in a mix of hops every few minutes starting at 20 and going through flame out, and dry, This is sort of a play on Dogfish Head’s continuous hopping, but I skip everything between 60 and 20, and do it in 5 minute chunks instead of continuously fed.
Generally for 5 gallons, I’ll take 6 oz total of 2 or 3 different varieties of hops, and stir them in a bowl. Then add an oz of the mixture at 20, 15, 10, 5, 0, and dry.
Varietals I like that work well together as late blends:
Chinook, Cascade, Centennial, Amarillo, Galaxy, Citra, Mosaic, Nelson Sauvin, Willamette, Columbus, and Soriachi Ace.
I calculate the IBU contribution of the late hops, then add a small dose of Chinook at 60 (on the order of 1/4 oz in a 5 gal batch) along with enough of a cleaner bittering hop like Magnum, Perle, or sometimes Cascade at 60 to hit the IBU target. I may have to juggle it around to get the IBUs right, like adding the bittering addition at 50 mins or something.