Check this out
That looks like an excellent recipe in my opinion. It will be a very pronounced chocolate flavor. I didn't read through the whole thing, just looked at the recipe. Obviously, leave out the raspberry, especially since it's raspberry flavoring and not the real deal.
Also, I didn't notice you can only do 15 lbs. of grain. You could probably get by with dropping the 6-row and reducing the chocolate malt a bit. I might reduce the roasted barley to less than 0.3 lb. also.