Hey blue -
Once you target the bigger creatures in the sea you might consider the ease of using a two-hander for bigger lines, flies, and fish. These are shorter than spey, quicker overhand casting rods designed specifically for big game fishing.
Drop me a line a couple weeks before you are going down there and if you are interested and if it's available I will send you a demo rod to bring along. All I ask in return is your honest feedback and shipment in a prompt manner once you return from the trip.