What you described last actually sounds like caster reacting against a too-weak power steering setup. More positive caster does in fact roll the tire over on it's side more, as was said. Versus simply pivoting the tire on it's patch as we tend to mentally visualize it.
In a manual steering truck, that much caster would have you pumping iron to get the steering started. Because of the geometry, it literally is trying to maintain it's straight ahead orientation when you're trying to change it.
There is also the possibility that the gear box preload is set too tight. If this was the case then your on-center position would in fact be in a slight bind.
Your trackbar is not parallel to your draglink either from the look of it. Yes, because the trackbar is now shorter than the draglink, keeping them perfectly parallel is not the same as it would be if they were the same length like Ford had them. But it might help to experiment with it some if you can.
To confirm what I said (or prove me mistaken) use some string or something to create a straight line between the two pivot points of the trackbar. Then compare the angles of the string and the draglink to see if there is a difference.
To my feeble geometrically-challenged brain, I would think you could get away with a slightly steeper angle on the trackbar when compared to the draglink, but yours might be a bit more than desirable.
And keep experimenting with the air pressures. Both front and back.
Also experiment with the toe-in to see where yours is happiest. I know you just had it professionally set, but you can easily keep track of how much you change it in one direction (start at 1/4 turn or less at a time on the bar) and you can easily put it back where they set it if you don't see any improvement. Try both more and less toe-in.
Glad you're seeing improvements and driving it. It's a beautiful thing.
You drivin' it up to Lodi next Saturday for our Roundup by any chance?
Paul
