I have a GM-8, but...
a) I once had problems where the mount would slew a bit and give a error on the screen and stop. People thought it was the slew limits, but it was the cmos battery needing replacing
b) check the slew limits perhaps
c) worm tightness - hmm, I doubt it'd have such an impact especially if your mount is well balanced, I'd expect it to have more of an impact on tracking accuracy (PE, backlash, slop, etc).
d) correct mount type specified in the gemini menu? think it defaults to Titan.
e) voltage - my GM-8 really likes runnning on 17v, 12v it struggles a little.
Hmmm... that's about me out.
Roger.