I rarely go down that far. I normally just do wade trips on the N Island. I was down off the tip last week and immediately to the right of the rip at the most South Western tip is some real deep water 10 feet off the beach. This is where a lot of fish migrate next to shore on the way around. Saw 100's of seals as they live there presently. Soon they will living off of tip of South Beach.
I will get back to you on the flats question. I've put out a couple calls to some of my flats boat Capt's concerning that area.Most of them do not go that far South. They normally go as far as Middle-West side South Island.
Ill let you know as soon as I know.