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Your photo shows a system of drive that should not present any real problems of balance so long as the worm, worm wheel and thrust races are in good condition and correctly pre loaded.
When moving west you are going with the track rate so acceleration is probably quite smooth but when moving east it is against the track rate particularly if you are stopping the movement and reversing the motor. This will accentuate problems of rigidity, backlash and motor directional performance.
I would be checking in this area for problems.
Barry
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