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In the weather conditions you have in Brissy I would be inclined to nail the decking down to the joists with twist shank nails. I would also use a galvanised plate under the bearers to keep a small gap under the timber.
With hardwood decking I also predrill the boards to prevent splitting especially anywhere near the ends of the board. With a 90mm wide board I nail 15mm in from each edge on every joist. Use galvanised nails and remember to paint or varnish the underside of the boards before installing to prevent the timber 'cupping' ( if only top is stained/coated the underside swells and then you have cupped boards that hold water and then the mould sets in.) Also stagger your joints unless you have long enough decking to go through in one piece.
Many use treated pine for joists but treated hardwood holds the nails better when the sun hits the deck and tried to ruin all you hard work.
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