My Mk4 donor build is now two years old and I have one problem I cannot figure out how to fix. The problem is that the steering will not self center. It comes most of the way back, but if I don’t correct it, it will keep going a little to the left or right depending on which way I turned.

Alignment is: (Power Steering)
Camber = -.05 LH -.06 RH
Caster = +7.8 LH +7.8 RH
Toe = .11 LH .13 RH Total toe = .25 Toe IN
Cross SAI = 0.2 degrees

1. I had to cut the adjusting nuts to get 7.8 degrees caster.
a. Should I cut some more and add even more caster?
2. Would switching to the new FFR two piece spindles solve my problem?
a. I see in posts the guys with the Complete kit have self-centering and tramlining issues too)
3. If I could find a set of Whitbys SAI mod and install it, would it fix my self-centering problem?
4. Any other ideas on how to solve this problem?

Here is what I have: Mk4 with donor hydroboost PS (1996), and donor spindles (1996), FFR upper and lower control arms, red Koni shocks, 9 inch 300 lb front springs (replaced 500 lb ones), 4-link rear axle with FFR control arms, 245x45x17 Goodrich tires on front