Running Mach3 on a XZero Raptor with Nema 23's -Smooth Stepper (ethernet) and Leadshine Mx3660 driver. The X and Y axis are so strong I can't stop them when under power, can't move them at all with machine on, however the z axis is weak, losing steps on lift actions, and I can move it by hand when stopped and when moving. What would cause it to be under powered? I've checked wiring, motor tuning in Mach3, and checked for gantry binding, nothing seems amiss. Bad driver? Bad motor, how to test? Any advice is appreciated.