I can't get my keling 387oz-in motors to step evenly with my G540. I am trying to tune them with the pots on the g540 and they are set at 4000 steps per inch in mach3. I don't know where the original pot setting was set to on my g540 because it has been turned in all different directions trying to tune them. It's weird because sometimes i can get the motor to turn evenly and consistently in only one direction but as soon as i press the opposite direction it will go then stop and go then stop. Its not fluid. I need help before i blow my head off here.