I was up there from 20th may for a week when the big storms come through and the passage was almost closed out.  Swells hitting the point down as far as NOR6 where sending water over the top of the cliffs.  Dinghies were doing OK inside the channel just out from shelter bay cam sites.

 But generally OK. There is a very sharp drop as you head out, more or less off Monkey Rock, where it goes vertical down to over 30 metres. This is where it will happen if it does. Stay away from the north side of the passage, it breaks everywhere there, but you should be able to see that. Tends to be a nasty, sloppy backwash sea out from the cliffs on either side of the passage.

I spent nearly two months working a crayboat out of there in the nineties, during autumn, didn't actually ever see it break across in that time. But when it does break, due to the sharp rise  and an outgoing tide, it will do so with no warning.

yep, have to watch the run out, especially in a small boat.