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Have a look at how the Jetstreams change throughout the year. During winter they are at their most northerly position, and generally run across Australia well north of Melbourne. During Summer they are farther South, around Tasmania or below that.
So twice a year if you live in Melbourne, you are going to get periods where the Jetstream is overhead a lot of the time. Coincidently, around this time of the year, and you are complaining of bad seeing. A chart I saw for last weekend had the Jet right overhead Melbourne at 140 knots. When you observe through a river of turbulent air moving that fast, everything will look like it is boiling. Not much you can do, except use lower magnification.
Moving to a dark site won't make any difference if the Jet is still overhead. You will see more stars than in the city, but the seeing will still be terrible.
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