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I wouldn't use Wazine. It only kills roundworms, not gapeworms, cecal worms, tapeworms, or any other type of worm that chickens can get. And, as you mentioned, the withdrawal period and necessary treatment times are ridiculous. If you saw worms in your chickens droppings, though, your birds...

Sounds like it certainly could be gapeworm. I would worm all of your other chickens with a wormer that kills gapeworms. Choices include Valbazen, Safeguard, or (the one I use), the Worminator. You can find the Worminator here...