Hey, so here are some troubleshooting tips:
* The difference can be attributed to
** one belt is tighter than the other
o Take apart and make sure the belts are the same tautness
*** Wear and scratches
o Take apart and look for them
**** Cim issues
o Use different cims, see if there is a continuation of the problem
* Cims at different ages will run at different rates and possibly fix the problem
* Look for cim with similar wear and tear and run the at same RPM - first year bot in the same mini tough box
*** If not already used, attach potentiometer on each actuator and attempt to fix issue via software
o Use example code found on AndyMark