It works well. I would bitter with the Chinook at 60 min, then blend the two hops for finishing. But the Chinook could overpower Cascade at 1:1, so I would blend it 2 parts Cascade : 1 part Chinook (or maybe 3:2 anyway). Or throw in some Centennial or Amarillo along with those for some more complexity. It’ll make a nice IPA.
I say use it as a starting point. Maybe 2 oz Chinook for bittering , finish with the blend of the rest. Personal tastes in hops vary widely - I use quite a bit. So use this amount, take good notes, and you’ll know how much to adjust next time. Let us know how it comes out !
It really depends on when you add them all. if you added them all at the beggining of the boil then probably to much, but if you do them all as aroma and flavour hops then probably not
I mentioned to use 2 oz Chinook to bitter, then to finish with the rest. By finish, start adding the blend with 15 minutes left, incrementally until flameout. Then add some more to dry hop. Not too much done that way.
I’ve bought bulk from both hopsdirect and freshhops. I’ve liked the hops I’ve received from both. Very reasonable prices. I’ve also used Farmhouse Brewing Supply when I need a few ounces at a reasonable prices. They sell in 4oz packs at a fair price. My local shops are typically selling at $2-4 per ounce.