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I'm guessing you're aligning on Sigma Octantis? 1 degree PA isn't going to cut it for the focal length you're working at.
Don't know how well you'll go, but try to get dark adapted and use averted vision to align on mag6.8 BQ Oct. This will get you just inside of 11 arc minutes from the SCP.
I'm fortunate enough in light polluted suburbia to be able to also just make out mag7.8 HD99685, which with BQ Oct. almost forms a Right triangle with the SCP at the Right angle. With dark adaption and averted vision and some time adjusting, this gets me to within around 5 arc mins.
You're probably not going to be able to see HD99685 from Sydney tho, but worth giving BQ Oct a try.
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