If I had those hops and was doing a DIPA, the schedule would probably end up looking something like this -
1oz Summit @ 60
1oz Simcoe, 1oz Cascade @ 15
1.5oz Simcoe, 1.5oz Cascade, .5oz Summit for Hopstand/Whirlpool
Dry hop with similar/same mix as the Hopstand/Whirlpool.
Not sure...