The disc mounting face and register along with the wheel bearing holes are all machined at the same time so unless the hub is damaged or the disc mounting face has some crap on it it should run true. If the discs are new and a decent quality there should be no issues. It might be an idea to clock the hub for run out before you go much further, it might also be worth looking at the hub where the bolt holes are and see if they are pulled/raised through over tightening. That may be holding the disc off the flat register. If the hubs run true bolt the discs on and clock them that will eliminate all the guess work and save a shit load of time . All quick and easy stuff, worth checking.
bob
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