Sorry I missed this post. I have dived there a couple of times but your best bet is to PM Greg V as he was my buddy and was much more familiar with the diving there. It was an amazing experience. I wrote a trip report viewtopic.php?f=142&t=3016&hilit=kai+iwi (scroll down to the last dive) and if you enter 'Kai Iwi' into the search function, there is a bit more info from other members
The weather gods played well enough to get out from Whatuwhiwhi with Andre, so didn’t end up going.
I read your excellent post and a few posts from others on the net and there are some quite different experiences reported. Hence was curious about the best place to get in and which direction to head, etc.