Great changes so far to the deck. I run a similar Jund Energy deck at FNM and have had a lot of success so far. The only way I can really add suggestions is to know what the metagame is like at your shop. That way we can decide if you need to go more aggro,protection, and what cards don't support the identity of the deck.
I would like to say, while I wait for your response, the Goblin Dark-Dweller is a nice touch that I have not fiddled with yet. A 4/4 Menace that casts UD on entrance is disgusting in the best way possible.