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I'd suggest Canopus and Rigel as setup stars. They're both visible and the only stars in that part of the sky with that magnitude.
Sirius is ok early evening, but if it is directly overhead, it may be allowing your backlash into the equation.
Check your power cable is anchored - if it moved in it's awful little socket, it may be giving you false movement signals.
I still haven't soldered a lead on mine, but I do clip it into a position where it can't move in the hole.
Getting the star to the centre is quite critical too.
Errors are compounded by being a little off on both stars.
I put the camera in and focus it on a bright star (Sirius) then go back to zero (vertical pointing at SCP) and start up my capture programme (APT - free download but they'd like you to purchase eventually - it works for me) there's a cross hair on that and at x10 you can get it very close. Then I can centre both stars with the camera already on the rig.
This means I can go straight to imaging once the system is aligned.
I also use PHD for guiding once all is running.
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