Hi I built one of the Ooznest OX CNC machines from a kit. Running 4pcs. NEMA 23HD56001Y steppers. So I sat up an Arduino with a CNC v3 shield and A4988 drivers and GRBL. Power supply with 24V 20A. All seems to be working so far, but the steppers do nearly have no torque, when I use UniversalGcodeSender to move the motors, I can hold them by hand and they fall through, meaning they do not have any moving torque to move the machine. When the motor is in still position, I am not able to move the pulley by hand, its very strong. After changing the stepper wiring in various variations (blue, yellow, green, red), reflashing GRBL, setting the stepper driver potentiometer to full power, I am kind of hopeless what else could cause the error. I hope someone here can help me! Thanks in advance.