Hey mate nice images! Well done with the processing.
I have a GSO coma corrector you can borrow if you want to try it out, I live in Sydney too.
The only problem I had with the GSO coma corrector was that since my scope is an F4 the focal plane is farther out so I needed to add spacers between the focuser and CC. AND with the coma corrector itself needing 75mm of backspacing between it and the camera I got weird stars on one of the corners because of all the spacers adding a bit of tilt. But you are on F5 it should be better for you. I got a baader coma corrector recently so the GSO coma corrector is extra for me.
Let me know if you're interested
Cheers