My F6B developed the dreaded wobble also. I tried everything including a Super Brace and changing to Elite 4 tires. The fix was to change to the All Balls bearings. Not a problem since then. The bike tracks and handles much better too.
So you did not try just tightening the head bearings first? When you changed the bearings what type were found to exist in stock form. Or maybe a shop did the work and you did not see.
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