Motor current is set by the pots on the stepper driver chips.
Do you know what the current specs are on your motors? If so, grab a DVM and see how the Vref on the drivers compares to the proper Vref for your motors. I'd try setting things to 1/2 the rated current and see what that does for you.
Do you know what the current specs are on your motors? If so, grab a DVM and see how the Vref on the drivers compares to the proper Vref for your motors. I'd try setting things to 1/2 the rated current and see what that does for you.