Steps per unit need set to tell Mach how many pulses it will send out to move your motor 1 unit (mm or inch) You will need to work that out. If you tell me what stepping you have the drives set to, what pitch the ballscrews are, whether you are inch or metric setup (default units from Config menu) and any gearing between motor and screw I will tell you what you should have.
Pulse width is on Motor Tuning page and if using the Shinese drives you may need to set this to 5 or more, maybe even need Sherline mode.
Hood