Woodie, there are dozens of managed impoundments at plantations and clubs along the NC coast, not sure why you would think there were not.
Managed impoundments exist all along the coast, rivers, and lakes in nearly all Atlantic flyway states,
One reason NC hunting is better is because they have licensed blinds on most major bays and sounds,
Blinds must be spaced at 500 yards and are licensed, so no first come in most areas.
They do not have the problem in those areas we have with 200 trailers at major landings on opening day competing for 4 duck holes they have all scouted when nobody else was there.
They do have those same problems in public lakes and rivers where blind laws do not exist, just read the recent NC forum posts about Jr Duck Commanders.
Good luck where ever you hunt, work hard at the game and you can find birds, even if it means leaving SC to do it.
I have hunted nearly all states in SE and several in Miss Flyway and hunting pressure is the same, but those that know how will find some birds.
Good hunting, be safe, and happy New Year to all.