I think the draggers fish offshore in the winter.
I've done some dives in the early spring in like 120 ft of water
Some times the wrecks are covered with flounder.
When your drift fishing, I don't think you realize how tight the flounder can be schooled up. By the time you reel 1 or 2 in your boat is out of them .
On the offshore wrecks and reefs short drifts or a swimging anchor are the way to go.
I found a web site the other day that had footage of flounder following a bait on a top and bottom rig. Awesome stuff. There are five or so fish swimming after the bait. I'll have to search and post the link.