Bull reds need a bit more water. If shrimp-laden popping corks won't work, try cut, whole or even small live mullet. Redfish can't resist eating mullet. Small croakers or minnows also attract attention from big predators. Mullet is a smelly fish and redfish love them.
Cracked crab is another good bait.
When they get big, they feed on the bottom a lot, but I have caught them on topwater. When he's ready to eat, he'll eat. Frequently, fish might stack up in one hole, but not even visit an area just feet away. Anglers who find structure, like old shell reefs, jetties, logs or other things to attract baitfish, find redfish. Along the beaches, especially along the Timbalier Islands, there are things that attract baitfish and shrimp and that attracts big fish.