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I'm curious about the distance from your reducer/flattener to the chip in your camera, as the image looks less flat than I would have thought it would be with that combo. Maybe if you could tweak that distance a bit, you'd end up with sharper results at the edges? The upper right in particular really shows coma. Baader makes some 7.5mm, 15mm, and 40mm spacers for t-adapters that might help get you closer. Look for their "T-2" extension tubes. Unfortunately I don't know of any similar products on the Australian market, but postage on these is really cheap from overseas.
Also, there seems to be a bit of field rotation there, most visible in the upper left and lower right. How is your polar alignment? I guess it could just be an artefact of the reducer combined with slight flexure in the imaging train making the coma present slightly differently in those areas, or maybe slight rotation in the stacking process.
Regards,
Eric
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