Never noticed wavy rotors before.
 

Hooked up my custom brake duct cooling lines today since winters officially over and noticed something when I put the rotors back on. With the rotors flush against the hub I spun the wheel studs to listen to the rotor possibly scraping on anything (which I didn't hear). As I watched the rotor, it has a huge wave in it. Like a bent wheel you can just see it moving side to side maybe 1/8". That's pretty wavy. No adverse effects though. Still stops amazingly and no sounds of any kind. Just a weird thing.

Lug nuts fitted ??

This is the only way to ensure that the rotor is flush against the hub !!

If it were out that much, you would definitely feel it. BGTV8 may be on the right track.

Used 2 of my spacer lugs on opposite sides all the way tightened down to put the caliper on. That's when I spun it.

try 3. I bet it wasnt even with 2

Hmm, maybe. She's all buttoned up now so I guess ill let it be.