I get the car back today after fixing an unrelated issue. He was going to take another look and see if there's anything glaring. I had them rotated 2 days before the vibration started happening which is why we were thinking it was tires.

I've had a loose ball-joint on my upper left control arm for a couple months that's getting repaired in two weeks (gotta space out the repairs due to finances). If the tires don't check out, that's the next one.