When installing the six screws, alternate the tightening sequence in a criss-cross fashion, and tighten them a little at a time. For example, lightly tighten in pattern like 1-4-2-5-3-6, then repeat the pattern using a little more torque, and finally a third tighten sequence such that the screws are fully tightened by the third (or fourth) evolution.
This ensures the rotor is flush against the hub and decreases chance for warpage.