Yeah, I would add roasted barley and decrease the chocolate malt to get something more stouty. Still even then it seems like it would be more of a porter although the oatmeal suggests an oatmeal stout.
I agree with adding roasted barley. I would say keep what chocolate is there and add a pound of roasted barley. Don’t mash any of that. Do a 24 hour cold steep of those grains crushed. By doing this method, you need more malt, but this finished beer has a much smoother less bittered taste.
I would either pitch a Belgian yeast instead of S-04 and call it a Belgian stout (after all the recipe did come from Candi Syrups) OR lose the D180 and add a lb of roasted barley and have a more authentic stout. Either way you would have a good beer.