Sooo... I'm an idiot. The bearings are fine. The spindles are fine. I pulled the driver's side wheel and before messing with the bearings again I decided to give the strut a good tug - "thunk." It turns out the play was in the suspension. The lower locking ring of the coilover was just loose enough to allow the strut body to move inside the threaded tube. I had checked this and I wasn't able to tighten/loosen the ring by hand so I'd assumed it was good. I further torqued the ring using the adjustment tool and a plastic hammer. Boom - no more play.
I decided to replace the bearing seals while I was in there anyway. When I did the bearings on Sunday I reused the old ones because I couldn't get the pre-load low enough with the new seals. This time I threw the pre-load instructions out the window and gradually tightened the spindle nut, with the brake rotor and wheel bolted on, until all play was gone.
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