Okay. There are a few things you can do here.
First, oats, Crystal and CaraPils all add body. So does increased mash temperature, don't forget! Anyway, I'd drop the Chocolate and CaraPils and increase the 60L Crystal. That'll get you the desired color as well as the crystal-malt body and character so crucial to the style.
Second, don't go overboard on the oats or it'll never clear.
Third, Aromatic can enhance the perception of body, though I don't think you should increase that amount.
Fourth, I love your hops schedule, though I'd never dream of using Galena; I'd have bittered with Challenger.