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Have you upgraded the primary mirror springs? I have had several GSO reflectors and all suffered from weak collimation springs - which allows collimation shift at different attitudes. The old Dob trick of collimating at a 45 degree angle might help, then observe the collimation shift as you change altitude.
Those steel tube scope will also be affected by temperature changes. If you allow proper time for it to adjust to ambient temperature your focus maybe more stable.finally, i would uggest testing with the stepper motor assembly off if you can, yo see if it is slipping. The weight of the imaging equipment maybe causing the focuser to slip. Try it manually with the Moonlight locked , assuming you have a shaft lock model.
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