I wouldn't waste Cascades on a stout bittering charge. The flavor won't come through unless you first wort hop, so you're better off using a high-alpha variety to get your 65 IBU.
I think you're better off reducing the amount of roasted grains, as well, to a total of no more than 1.5 lbs. You have a few choices. You can eliminate the Chocolate entirely, or you can juggle both amounts. Some claim that one roasted grain only gives a one-dimensional flavor profile; I think those people are talking through their hats. There's enough going on, flavor wise, in this grist without two different roasted grains, because you've got the sweet, dark fruit of the 120L Crystal along with the nutty silkiness of the oats. The Starbucks-like bitterness of Roasted Barley is a perfect complement to those flavors.
In sum, swap the hops for a high-alpha variety and delete the Chocolate malt from the grist. That's my recommendation.