Hi Tom,
Will be interesting to hear how you go - but from long experience up here (30 years of going to the reef north of Cairns - bl00dy hell - getting old) - you will find that a 4.5m boat won't cut it at all in 20knots up here. I expect you will find that the "wind chop" won't be anything like you'll expect. Have been there and done that in terms of fishing the reef up here (with Mark mostly actually) and its no fun out there in a small boat. (to paint a picture - Mark and I went out recently with a mate in a 7.2m centre console in 15-20 knots and it was not nice at all - we sat behind the reef all evening and ended up pulling the pin as we couldn't find anywhere comfortable to fish.
Having said that - the time you have picked should see a totally different sea - "if" it plays out normally for that time you year you will hopefully get morning land breezes followed by a mid-morning-early afternoon change to a north easterly - that can get up to 20knots. If you get those conditions you should be fine - though the ride out of a morning with a half metre westerly chop will be a bit bumpy - but doable all the same in that boat. Its an awesome time to fish up this way - the only thing you'll have to worry about (being a Victorian
) is dealing with the oppresive heat!!! (just cool down on the trip back in getting wet from the NEly
I'm hoping to be out there in my own 16 footer at that time - just got to get it back on the water.
Re jigging - another mate has had some good fishing with Jigs a little further east than the spots Mark mentioned to you. The green island wreck rocks for Jig fishing as well - just be prepared to loose a few - the GTs on the wreck are monsters (and the wreck is sharp). (you don't worry about sharks knocking your fish off at the wreck - its the GTs that do it!)
The other thing to be aware of - up here we have closed seasons for Coral Reef finfish around the new moon in October/november - so that means you can only target pelagics during that time - this year 24-28 October is closed - so just factor that in for your trip.
Cheers,
Craig