Forum:Advice on my Zombie World Deck Please

Hey guys, I put together this zombie world deck and it has won me some matches. I however got wrapped up in editing it and editing it trying to improve the deck that my winnings have been diminishing. Can you guys give this a look and give me advice on what am I doing wrong here?

My strategy is simple. Swarm the field and take over their monsters. My books of life can take care of pesky cards like Stardust Dragon. Tutan mask has been incredibly useful because once Zombie world is out, I can protect my zombies and stop my opponent's monsters from getting pluses since all monsters are now zombie. I'm trying really hard to keep it to being just zombies but Gorz has been a huge life saver. Also I can't seem to get Archfiend Zombie Skull out because of my level differences. I'm also not very happy with my Despair from the dark but its a nice strong monster for those who over power my main card, Red Eyes Zombie Dragon.

Advice please.