I know it is not one of your choices, but I like:
Centennial at 60 and 15 (about 2/3 the IBU)
Cascade at 10, 5, and 1 (about 1/3 the IBU)
Amarillo dry hop 2 oz
And I use a 1.0 bittering unit/gravity unit ratio for IPAs and Imperial Amber, 0.65 for Pale Ales and American Amber.
Eric
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