Grain bill is good...if you wanted you could add some wheat in there or a cara grain for a little body...
Personally, I like my IPAS in the 50-60 IBU range...so for me the hop schedule would be an 1 oz for all you hop additions of cascade...I would also maybe get rid of the 45 minute and up the 15 and 5 additions to 2 oz each to really get that nice citrus cascade flavors.
Cheers and Good luck!