For me it's mostly a numbers bait but that can also vary based on the plastic you choose. I'll use an 1/8 oz weight often times (heavier if you're fishing deeper) and will use all different types of plastics, I really like beavers with it or items that are a little wider like a Deps Bull Flat. If you want to catch some big ones on it toss on a Magnum Ol' Monster (Rage Tail Anaconda ?) or one of your favorite magnum worms, I bet it would work.
If you want to stick with Zman I'd try a palmetto bug.
Glenn has a good video on it here --