We spent 4 days there a few weeks ago in 5.5' draft monohull. after carefully cruising the four front (toward the entrance channel) rows of balls we found the best depth was in the middle few rows going toward the outside (away from the restaurants) of the mooring field. It started to shallow up again in the last row outside. While we were there a Moorings cat went aground toward the middle-back (away from the entrance channel) of the mooring field. They were there all day with the current pushing them on until a service boat arrived to pull them off. I was surprised by the number of folks entering the mooring field at relatively high speed in some large cats and also also at others cutting inside the last green channel marker. Take your time, stick to the channel and be careful and you shouldn't have a problem. There were several large monohulls anchored in front of the mooring field (where we were showing 8' + depth) without any problems so that may also be a good option for you.