Not sure about the chocolate bc I've never used it, but you are probably overdoing it with the dark ME and the dark specialty grains. Dark ME has the dark grains already it it, so if you use both, not only will it most likely be darker than you want (ie black), but also have more dark flavors (burnt, roasted, etc.) try using mostly light ME and a little dark with the specialty grains. Using ME in general, as well as doing partial boils (which is the norm for extract) will also darken the wort. Good luck.