bittering hops add...bitterness. They're bittering hops because they have high alpha acids, which requires less hops to be boiled. The bitternes balances out the maltiness of the beer. The longer you boil, the more bitterness you get and the less aroma and flavor. The less you boil you don't get the bitterness, but you get flavor and aroma. I would add a low alpha acid hop to get a good amount of flavor and aroma, within the last 15 minutes. You can even do this at flame out if you want more aroma than flavor. .5 oz will probably be good for this style of beer.
Thanks for the input