Having done this trip three times now, I'd probably advise go as late as you can. Wait for settled trades and don't rush your leaving. We did last year and paid the price
with 50 knots of SW - not a nice passage
back to NZ. Boats that left in late November seemed to fair well last year. It may be in your best to employ the services of a local weather
man called Bob McDavitt to do a weather
for you. He charges around $100 NZ and it is well worth it. I note you have a 43 ft Beneteau
so your trip should be fairly fast meaning you can plan to miss a weather change. All the best. We are leaving Townsville in the next few days for New Cal
and then back to NZ - might see you in the Bay of Islands NZ in December!