Have not been there in several years but last time I was there I was on a mono with a 6 ft 9 draft. Picked up a mooring ball on the Ivan side of the bay. No problems. But I won't do it again. White bay is red lined by many charter companies. For good reason. So I suspect that may be why you are not getting any replies. Better to pick up a ball in Great Harbour and dingy or taxi over.