Toss in a 1/2# of carapils. I'm guessing that you are doing an ounce for each of those additions. Just working with those 4 oz of hops I suggest moving that 30 minute addition:
1.25 oz amarillo (60)
1 oz cascade (15)
.75 oz amarillo (10)
1 oz cascade (5)
Something like amarillo, cascade, centennial, columbus, etc would all work well for dry hopping this. Pick an oz of each and go crazy. Or an oz of any of em, will still have a great nose.