You can try what hood suggested, since that is what you should really aim for, to limit accel and velocity rates in tuning so that your motors never miss steps.
But yes, that is what i suggested lower feedrates and depths of cut. Stepper motors lose their torque when increasing their speed. so if you are making a faster cut, you would have less available force to make that cut, and if on top of that the depth of cut is bigger, you need even more force for that.
Fernando