http://deckbox.org/sets/468095
Well, I took your advice. I got rid of some of the more specific, one use cards (like Tilling Treefolk) and added more creatures. Turns out, my biggest strength was being passive aggressive. As soon as people saw that I was playing big things, they turned on me and I didn't have enough creatures to handle them. I could just keep adding more creatures, but that would just change the deck too much (and I'm not a big fan of that style of play anyway).
So in the end, I kept the creatures more threatening as defenders (Stuffy Doll, Acidic Slime, the Spider). Stuffy Doll has the added bonus of 'combo's and is immune to all of my boardwipes'. I also added a bit of enchantment/artifact destruction while I was at it. And now I don't know which two cards to cut... perfect.