Can I just chip in on this one,
What Craig is saying on castor is what I have found during my rebuild.
When the front suspension was put back together without springs, it gave me an chance to check the bump steer through the full stroke of the damper, I checked the bump steer and as you start putting on more caster the toe in to toe out change was huge.
At the moment I have reduced the caster and raised the rack on shims.

Paul