Kia Ora Dave.
I am the Great Grandson of Ngamiri Paretekawa and Tawhi Erueti.
Ko Eddie ki ahau o te Hapeta whanau. (Herbert).
I'm not sure if you're aware of a whakapapa book which was published in 1992, but it starts with the line of Whareangaanga Te Kanawa.
My best bet would be to find this copy and take it from there.
Also...there are whanau in Otorohanga who would help you.
Kamoe Herbert, and her family, are able to assist you perhaps, and she is the daughter of the late Uncel Jimmy Herbert.
She has the original framed portrait of Ngamiri and Tawhi.
My father, Mervyn John Haines, lives opposite her.
Although a Pakeha...is very knowledgeable on land issue within the Waikato Area.
We are hoping to get as much information concerning whakapapa and land from him as age may take him very soon.
Let me know how you're going.
And Kia Ora to another whanau member!

Ora Mai
Eddie.

Kia Ora Dave,
The Pakiha name for Erueti is Edwards,and there are many.
I know the areas you have named as some of them are areas my Grandparents grew up in.
Down the Old Mokomoko road(Back way to Raglan from Kawhia)about a mile on the right on a small grassy nob over looking part of the Te Pute channel,once stood an old rusty iron fence,approx 3 meters square.
Mum once told me that the Papesch of old were burred there.
[ 40 odd years a go this was part of Scottie Mackloklins (Jim) dairy farm.Today the land has been divided and two houses now stand in the area.When I looked for the old tomb stones 30 odd years ago the place was covered in black berry's.]
This bit of imfo may help lead you on your quest Dave.
My e-mail; is richardawilliams@hotmail.com
if you need to contact me,I live in the area.

Kia Ora Dave

I am the great grandson of Hotukopa Tututu Te Kanawa (Troy) my mother (Evelyn Tekanawa) and her siblings are part owners of Te Motu Island.

Give me a shout on troy.raynerx@gmail.com if you want to chat.