Here's my take on this subject, and I personally think it applies to other makes of HD as well. Since I've had two bikes with the Traxxion front end work, and ridden a couple of other bikes lately without it, this is my conclusion....
First, when we were riding Saturday, there were some fairly strong crosswinds coming across the fields out in the country in Kentucky...that adds a variable into the mix to make tracking even more unpredictable, no matter what kind of bike it is. I think what the Traxxion does, in addition to providing a better ride, is it simply reacts more quickly to road surface irregularities, keeping the front tire firmly planted on the pavement at all times. One of the first things I noticed when I had the work done on the Ultra was how much LESS it moved around, even going in a straight line down the interstate, and particularly when passing big trucks, etc. I noticed the same thing when I got the Vrod done a couple of months later.
When I rode Ken's black V, one of the first things I noticed was how much "lighter" the front end felt going down the road at speed, and of course it was even worse when accelerating through the gears. I think the front end is hopping around, and when it moves over even a little bit, the rear end has to follow, so it feels like the rear end is "wiggling", when in fact it's just lining itself back up with the front tire.
I honestly think this is happening to some extent on all the other bikes reporting "wobble". If your front tire is "skipping" around on the pavement, the bike feels more unstable 'cause the rear end is constantly realigning itself with the front and it feels "loose". If both tires are not firmly planted onto the pavement at the same time, all the time, the bike does not feel as stable. I'm not saying the front end is jumping an inch at a time, but just very small loss of contact with the road surface from either end of the bike makes it do some strange feeling things.
That's why I'll never own another HD without putting a good solid suspension under it, on both ends. My personal opinion is that is where people need to start out with the "wobbling" problems, and then if necessary, go to the alignment devices like True Trak, TWR, Ride Str8, Sta Bo, etc.
Ken, don't misunderstand...your V rode out fine, but the feeling I got from it was it just wasn't as stable in the front end. Not something that scared me at all, but I am just so used to the Traxxion, anything else feels strange to me now. With the speeds the V's are capable of running, and how quickly they accelerate, it's just a little disconcerting to feel the front end acting "light". But without something to compare it to, nobody would ever think twice about it.
That's my theory, and I'm sticking to it.