Nice to hear your wobble's fixed. After all you've had done, try a swerve and see if your scooter's still as nimble as it should be. I had a bike the dealer adjusted the head bearing on that was downright dangerous is was so tight. Too tight and we lose our ability to swerve - too loose and the bike loses its ability to absorb a wobble.
If memory serves, you want between 1 and 2 swings. If it stops short of 1.5 swings, loosen it till the wheel stops right at or just barely beyond top center of the swing, or 1.5 swings.
My '12 model has 5500 miles on it and I took my hands off the bars last week decelerating while coming to a stop. I had the wobble. I've had bikes before that had it so I didn't spas out. I just took it by the dealer, since it's under warranty, and they brought it back to 1.5 swings - it's all good now. I can tell it's tighter, but it feels like it should now. The bike still swerves as it should with no decel wobble.