Originally Posted by Skippy

Not #1 as I am aware of that pin and the hole in the rotor that it goes in.
If #2 how come I didn't have any problems from the time of their installation in 2005 until now?
With #3 I've had an identical issue while using the old rotor from 2005 as well as a new one. The old one worked fine for 7+ years.

That leaves #4 as appearing fairly likely, but it seems suspicious to me that the issue pops up simultaneously with a bearing change.

I'm thinking about swapping calipers side to side to see if the issue follows the caliper. That would put the bleed screws in the wrong place, so I don't know if I'd be able to bleed them satisfactorily.