I have the same setup (installed just prior to moving for 3 years to Germany) and to be honest it is like a brand new bike. The bike used to make me a bit anxious if I was going down hill and had to take a quick turn as it felt "unstable", although it never actually did anything unexpected.
I don't think my full bagger will out-corner a sports bike with this setup, but it feels much more solid on the twisties and switchbacks over here and I keep up with most of them when I chose to.
I have not messed with the dial on the Bitubo, or the settings for the Traxxion. Seems to be a little harsh for 1 up, and about perfect for 2 up riding. Even though I had them set my bike to be 1" lower than stock i hardly ever scrape the floorboards with this setting.
I wonder how much of the Harley wobble blamed on lack of frame or swingarm stiffness is actually suspension related? For the price of the bikes this setup should be standard, or at least a suspension upgrade option.