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This is a long shot and someone might be able to explain better than me, but - have you tried taking much shorter subs?
Whenever I tried taking long subs with my old ED102 and 650D I would get severe vignetting which was from the severe light pollution washing out the image (I noticed you mentioned you're near Brissy).
I live about 10-15km out from the Melbourne CBD and the most I could achieve before starting to get my images washed out was about 60 seconds. I could be wrong, but worth a shot!
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