Hi Mitchell
Sounds like a good holiday.
I found the Taylor brothers very helpful on my short trip up there, try and read their reports or email them. Unfortunately the weather was blowing pretty hard when I was there.
I'm by no means an expert but I have fished around the west side of yiundalla island and neighbouring island buddi buddi island, they a small rocky outcrops which drop away quite deep and has a lot of current. It's about 100m long and we trolled for mackerel out the back while two threw poppers out the front for gts.
Also try windy bay opposite whitehaven beach in the eddys and current.
Good luck and have a good holiday