I just downloaded the newest version if Mach 3 and when I was jogging everything sounded smoother than before.... so I started playing around with motor tuning. I was able to change my X and Y axis from 18ipm to 52ipm... this screams now.... I am still rebuilding my X and Y supports because I get some play in them (esp at these speeds)!!!
So what changed? I was running 1.90.032