Hi Warren,
I do a Swains trip every 18 months or so with a group of guys from work, the next will be my 6th.
I got my first GT there on a Nomad 80 gram stickbait. There are plenty to catch, you just have to get away from the bait fishermen and chase them.
Around the edges of the reefs are the best places I found last trip, where the reef falls away into 10m or so. Look for eddies on the down current edge and any points exposed to the current, and bait schools.
As Randy stated its not much fun fishing high drags out of an unstable dory. The boat I go on has 4.2m Quintrex dories which are good for casting.
Last trip I used 100lb braid for all my lure work. The gear you mention should be OK as it will cover most styles from small poppers for trout to medium GT's, but a 24KG Tcurve may be more suited. Because the Swains is fished so heavily by rec and pro fisherman the size of the trout are down. A 5 KG trout would be an exception. Most we catch are 2 to 3.5 kgs. They will still smash a well placed and worked lure though.
The lures I normally take are,
150 mm River 2 Sea Bubble Pops for trout. Any color as long as its green/gold!!
Halco 135mm Rooster and Haymaker Poppers
80/100 gm Nomad/Blackjack stickbaits
Halco Laser Pro 150 and 190 mm gold, green and blue for trolling, 1m for on top of the reef and 2.5m for bluewater trolling.
Halco Crazy Deeps for deep water trolling, 125mm, 150mm and 190 mm.
Next trip though I am taking Barra gear and lures/plastics for trout and some heavy Popping gear for GT's and target them specifically.
And upgrade your terminals to decent hooks on Owner/Decoy rings.
Don't worry about the weather, you can't change that, its just luck. On my last trip we had 3 days of 30 knots and still caught fish, 42 Knots for 18hrs on the trip home left a bit to be desired though.
The best bit of advice I can offer though is to constantly try different things if the fish aren't biting. Jig metal for Mackeral, pop for trout, troll for trout over the top of the reef, troll deep lures on edges, cast lures/plastics at bommies, fish deeper water, in current, out of current etc, etc.
Its a long way to go to not make the best of the trip. It is too easy to come home and say the weather was bad or the fish were off the chew. Something will work, if you perservere you WILL catch good fish.
Hope this helps,
Ken