Unfortunately there really isn't a gutter any more Mr Spag except for the short one a little further north which you were sailing in, but as you probably found out it's very shallow. By the time you guys got there the waves were getting dumpy and it was more difficult to get out than it was earlier, so don't be too hard on yourself
A few months back there was a fanstastic gutter which ran for about 2km and was waist deep virtually all the way.
there is still the superbank further out that causes another kind of giant gutter but u need a very low tide for it to flatten out the water, and it was dead high tide when you were there
It seems to come and go and we need another big storm to repair it