Thinking about it... issues with steppers vibrating have been solved by using "rattlers", I remember people attaching magnets to anvils to reduce the noise, a white paper I read recently said that more bolts reduced vibration... so would it be feasible to incorporate something into the mill design (or table design in this case I suppose) that would help? Not just adding mass, but moveable mass in the same way the "rattler" uses loose components to work?