The 2018 Octtava shiraz that you got and tasted to me looks like a Victorian Shiraz. I would totally understand your comments re it being light and almost like Pinot Noir being a cold climate shiraz.
Now the one that I got is
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Barossa Shiraz - so hopefully it is more fruit driven and fuller bodied. It is matured in French oak so I would imagine would not be huge bodied or mega bold. The wife being a musician loved the label so I only got 6 of them. Can't imagine it being undrinkable but will wait and see what its like. Will report back!