Have you tried moving the tire 180 degrees around the rim? I've had to do that with a Conti tire that insisted on hopping when I installed it with the label at the valve -- rotating it cleared that up.

If nothing else, +1 to filing the fork. You've got plenty of meat to remove and it's easy to do. Just don't get filings into your bearings, and touch up the exposed metal with some fingernail polish afterward.