Hi Malcolm,
Although I haven't used the Sirius G myself, it's possible that the problem could be remedied by re-flashing the hand controller firmware.
Alternatively, I recommend the integrated drift align feature which is available in the latest builds of PHD Guiding (AKA OpenPHD). I started using it a few sessions ago and even if you're not able to get a star which is close to the horizon, it will give you a an accurate polar alignment in just a few minutes.
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