For a swarm AND Zilla player it seems very "baron" of modals. I would suggest more Gaunts and some Zaoethroopes and/or Tyrant Guard. They will help alot. My self i use the same sort of thing but i love my warriors so i have a mountian of them insteadf of massive swarms (might change my mind when GW fianly pull there hands out form there asses and release the Tervigon modal)
"Never take life seriously. Nobody gets out alive anyway."
People i have turned into Chaos Spawn