Could be alot of things. Like others have mentioned, try smaller, bigger, slower retrieve, faster retrieve, scent maybe. You have got them interested, now you need to seal the deal. Trial by error is your best bet. Just let the fish tell you what they want and how they want it.
P.S. I love running lizards on top. But Sssshhhhhh. Keep it a secret.
Quick question? Are you waiting until you feel the fish or jerking on the blowup? Maybe wait a secong longer?