Like 2Ln, I did a number of mods to mine. The true track and bushings, Traxxion AK 20 front shocks and 44 Progressive rears.
The combination of all make the bike a really nice handling machine.
As Don said, each thing adds it's own small improvement, although in the case of the AK 20's from Traxxion I would call it a "big" improvement in my case.
Rog, I've not done anything that was more profoundly improving than the Traxxion front end. From the first moment you get on the bike pulling away from the curb it's just an astounding level of difference.
It obviously is not going to help any rear initiated wobble. In case where the dog starts shaking and that leads to the tail wagging, however, it has to help. The ass end can't follow the front (and start a shake all its own) if the front end is a lot more stable.