I would begin with three points. I'm assuming you have three per side, use one center screw and two outside screws on the opposite side to get it ROUGH level. Get the machine square to the world north to south and east to west. Now, everything you do beyond that point will slightly hinder that perfect Level to the world condition. Keep in mind the most important thing on leveling is how the machine components move through space, that's what makes accurate parts. After the machine is rough leveled, run the last three screws down to contact. Now place your level on the table in line with the x axis and power up the machine, run the saddle + and - and check for twist (pitch), then rotate the level in line with the Y axis and check for bow (roll) you start from the bottom of the machine and work up. Next perform the same check on the X axis, if Y was done correctly and your machine is good X should be right there. Your last check on a vertical is spindle sweep. Using an indicol and test indicator sweep the table at various points of all the travel and adjust rear bolts to tilt the column as necessary, it takes very minor adjustments to correct tram. Once completed you'll find that the degree of "level" was slightly compromised, not an issue, you want the machine to move accurately through space, that's the end goal. I'be spent many hours in training with mazak to learn some of these basics of leveling and I don't consider myself an expert on leveling yet but hopefully I've passed on some basic points that will help.
Chris German