No one knows for sure when Ron Davis first envisioned his original surface slashing ChatterBait. That includes Davis himself, whose workshop harbors an astonishing collection of never-before-seen, occasionally theoretical fishing lures. Some of these, Davis reserves for his personal fishing experiments. Others, like the new Z-Man HellraiZer . . . let’s just say this one was too good to remain undercover any longer. “I remember fishing the early versions of Ron’s remarkable topwater lure and hoping I could keep it…