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My first question is; are your joists 16" centers? with 2x6 decking they may have gone with 24" centers? I don't know I'm asking.
I would re-think the 1x lumber. At very least you are going to have a tremendous amount of bounce and movement. Keep the decking flat on the joist. Pack the gap and put a trim piece over that bridges between the packing and siding. Or pack the gap between the siding and joists and the start the decking at the packing.
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