I did a little bit of research while waiting for a raal expert to show up. Ran into this:
http://www.anewtoronto.com/wheel alignment.html
They say (direct quote from the web site):
"Like caster, it provides directional stability and also reduces steering effort by reducing the scrub radius.
If the Steering Axis Inclination (SAI) is different from side to side, it will cause a pull at very slow speeds. SAI is a nonadjustable angle, it is used with camber and the included angle to diagnose bent spindles, struts and mislocated crossmembers.
The most likely cause for Steering Axis Inclination (SAI) being out of specification is bent parts, which has to be replaced to correct the condition. On older vehicles and trucks with king pins instead of ball joints, Steering Axis Inclination (SAI) is referred to as (KPI) King Pin Inclination. "
You can read the rest yourself, but the whole question seems to come down to this: "Why is your SAI off by so much?" If it were in the 10-12 range, I might not have questioned it so much. It is triple the factory maximym. This may be a reason for the instability at speed you are seeing, the SAI measurements from your alignment shop are correct, and as per the above web site, SAI has a defininte effect on stability.
I am going to ask a stupid question here, bur it is possible that the upper control arms have been swapped left to right? Or the lower control arms? Reason I am asking is that a 25 deg. SAI sounds very, very off.
Kostas
"