You should check these electrical items:
1. Calibration of speed control if they are PWM.
2. Longer wires could add electrical resistance to both/either side of the speed control.
3. Wrong gauge of wire could be an issue.
4. Bad auto-resetting circuit breaker in PDP should be worth a quick check.
5. Bad connection somewhere.
6. Check any feedback sensors if using a PID loop in the control system.
On programming check:
1. The values sent to the speed control.
2. If you are using PID loop check that the P, I and D are set the same.
Adds to my big-bag-of-CSA stuff
