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Proper gear shimming, check the angle of engagement from the piston to the gear teeth, and not using a battery that's too strong for your setup.
I wouldn't recommend the modify piston you've got to the left there... I haven't had very good experiences with them... I've found the slightest jam will strip 'em pretty badly.
I'd suggest a Prometheus, Modify Ultra or System (not systema, system)
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