I'm not sure what the AA% is on Summit but I'm sure it's not not high enough for that to produce a balanced beer.
Summit is like 17-19% IIRC. I haven't brewed with it yet but it has me really interested as I think it should make for a great APA.
I haven't run this through Beersmith, but I do agree that you'll want at leat 30-35 IBU's at that gravity...so just watch your IBUs.
Otherwise it all looks pretty good. Have you picked a yeast? If you're wanting a lighter mouth feel I'd try keeping your mash in the 150-152F range and use some US-05 to dry it out nicely. My 1.058 APA finished out at 1.008 w/ a 152F mash temp and one packet of US-05. It's cheap too!