Hey Kym,
In SA, Karl N is riding a 7'10" x 30.5" and I think he is about your weight, Josh B is riding a board around the same and he is arnie swarzinegger
at 92kg. I am at a fat ass 92kg (love wild turkey and pizza), just shaped 2 boards for myself, one is 8'6" x 30.5" and the other 8'3" x 30.
So the naish 9'3" will float you easy, its just a matter of balance.
Regards,
Scotty