I would have to agree, that the best and most up to date information will come from those who live and work in New Zealand today. If the two mentioned do not respond to your thread you might also attempt to get information from them via pm.
I was ask to respond, but we were there over 25 years ago, so I am of no help.
When we visited we found the people to be delightful, the island's are beautiful, and the hunting AND fishing to be very good. Fishing ---both fresh and salt water was enjoyable.
I did have some friends hunt N.Z. since we were there, but this information is also a bit dated, but they said that Poronui had some excellent hunting, good guides and very nice accommodations . They said they hunted Fallow, Rosa, Sitka and Red with these folks.
They said they provided several activities for the non hunting guests as well.
I wish you the best of luck on your hunt. You will enjoy your trip, it is a beautiful . Have fun
p.s. We also enjoyed hunting the Tahr. If time and funds permit, it might be something you would enjoy as well.