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Hi I have a thought on this.
The old LX200 classic had inverter drivers referenced to a fixed voltage to handle the motor drivers that were l2724's. The RA motor driver was supplied with the main supply rail 12-18 v but the Dec was supplied from 5 volt. The effect I noticed was that some Dec drive worked better than others. A later mod changed this supply to 12 v.
The LX200 design was probably from manufactures specs (no copyright problem). I would expect the Gemini drive to have been done the same way so maybe the motor drive circuitry should be examined for the Dec verses the RA.
Barry
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