If you are using the Starshoot autoguider part of your problem is you are using a GPUSB. The starshooter is a stand alone unit.
with your azimuth adjustment, loosen the main nut under the tripod head just a bit and once you've got your polar alignment tighten it and then recheck. It shouldn't have moved much. Certainly not enough to worry short FL autoguided images around 5 min or so
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